Table of Contents

Component Description

The objective of the dietary interview component is to obtain detailed dietary intake information from NHANES participants. This documentation describes the data files associated only with the collection of dietary supplements and non-prescription antacid use.

The objective of the 24-hour dietary supplement use component is to obtain information from NHANES participants on the types and amounts of dietary supplements (DS) consumed during the 24-hour period prior to the interview (midnight to midnight), and to estimate intakes of nutrients from those dietary supplements.  From 1999-2006, the 24-hour dietary recall interviews or dietary interviews only asked about food and beverages consumed. Since 2007, data is collected on the usage of all vitamins, minerals, herbals and other dietary supplements as well as non-prescription antacids, as part of the dietary interviews, directly following the collection of dietary intake from foods and beverages.  

Since 1999, NHANES has been collecting data on participants’ use of dietary supplements, in the past 30 days, during the Dietary Supplements Use Section (DSQ) in the household interview since 1999. However, prior to the 2007-2008 data release, estimating total nutrient intakes from all sources (foods, beverages and DS), was difficult because of the different data collection methods, referent time frames, and data formats. These data are now collected using similar methods over the same time frame; therefore nutrients from all sources can be easily combined. This allows researchers to improve the total nutrient intake estimations as well as examine associations by nutrient source such as from foods versus supplements. The improved nutrient estimates increase researchers’ ability to examine nutrient-disease or nutrient-health associations and to estimate percentages of the population with intakes over or under various nutrient standards.

All NHANES participants are eligible for two 24-hour dietary recall interviews. The first dietary recall interview is collected in-person in the Mobile Examination Center (MEC) and the second interview is collected by telephone 3 to 10 days later.

Similar to the format of food and beverage intake files, two types of dietary supplement intake data are available from the two dietary interview for the 2011-2012 survey cycle: Individual Dietary Supplements files and Total Dietary Supplements files. Each dietary supplement data file is accompanied by codebook, and frequencies. This documentation applies to all files.

Distinguishing Between Foods/Beverages and Dietary Supplements in NHANES

Distinguishing between foods/beverages and dietary supplements can be challenging. In order to make sure that the food and beverage intake files and DS intake files do not contain any overlapping products, trained nutritionists at the National Center for Health Statistics (NCHS) and U.S. Department of Agriculture (USDA) Food Surveys Research Group (FSRG) review questionable items reported in the dietary interviews. Products that are labeled as a dietary supplement, have a supplement facts panel on the label, and are in forms, such as, tablets, capsules, softgels, or gelcaps. Items that are powders or liquids can be hard to distinguish. General guidelines used state that if powders and liquid concentrates have product directions stating that they be added to a liquid, they are classified as beverages. Examples are teas and protein powders. An exception is made for fiber products, which are classified as dietary supplements. Along this same guideline, energy drinks are considered beverages, but ‘energy shot’ type products are considered dietary supplements.

It is best to refer to the two databases that detail every food/beverage and dietary supplement reported in NHANES to identify exact determination used.

The databases are: 
USDA's Food and Nutrient Database for Dietary Studies (FNDDS) 2011-2012

NHANES Dietary Supplement Database 1999-2012


24-hour Dietary Supplements Data Files: Four data files were produced from the dietary supplement use component of the dietary interviews: two Individual Dietary Supplements files and two Total Dietary Supplements files. Each file includes one day of intake data. The number “1” or “2” in the file name identifies the day (and mode) of the interview: 1 = first day (MEC), 2 = second day (phone). File names are as follows:

File Names for 24-hour Dietary Supplements Data
File Day 1 Day 2
Individual Dietary Supplements DS1IDS_G DS2IDS_G
Total Dietary Supplements DS1TOT_G DS2TOT_G

The nutrient amounts in these files reflect only nutrients obtained from non-prescription and prescription dietary supplements as well as non-prescription antacids that contain calcium and/or magnesium. Throughout the documentation, “antacid” will specifically refer to non-prescription antacids that contain calcium and/or magnesium. They do not include nutrients obtained from foods, beverages, and water. Data on intakes of foods, beverages, and water are available on the NHANES 2011-2012 Dietary Data page.

Individual Dietary Supplements File (DS1IDS_G and DS2IDS_G): Contain detailed information about the types and amounts of individual dietary supplements and non-prescription antacids (that contain calcium and/or magnesium) reported by each participant. The names for both Day 1 and Day 2 variables are listed in Appendix 1.

The Individual Dietary Supplements Files include, for each interview day, one record for each dietary supplement or antacid consumed by a survey participant. Only participants’ that had reported taking a dietary supplement or antacid are included in these files. Each dietary supplement or antacid is identified by a supplement ID number (DSDSUPID) and each record contains the information listed below: 

  • Number of days of complete intake obtained from participant 
  • Day of the week of the intake 
  • Name and ID number of the supplement 
  • Amount of dietary supplement consumed in serving size, which is calculated as the reported amount consumed divided by the serving size from the product label
  • Amounts of 34 nutrients/dietary components (listed in Appendix 2) from each dietary supplement and antacid, as calculated using the NHANES-DSD

This file only includes intake for a select group of nutrients. These records can be linked to the NHANES-DSD, using supplement ID numbers (DSDSUPID), to obtain more detailed information on reported products. The NHANES-DSD datasets provide information on nutrients in the dietary supplement as reported on the product label. Botanical ingredients would be an example of nutrients not released in the Individual Dietary Supplements files, but can be obtained from the NHANES-DSD files.

Total Dietary Supplements Files: (DS1TOT_G and DS2TOT_G): Contain, for each participant, daily total nutrient intakes from dietary supplements and antacids. The names for both Day 1 and Day 2 variables are listed in Appendix 3.

The Total Dietary Supplements Files provide a summary record of total nutrient intakes from dietary supplements and antacids for each individual. All participants that had a complete dietary interview for foods and beverages are included in this file. This includes users and non-users of supplements and antacids. Each total intake record contains the following information: 

  • Number of days of complete intake obtained from participant 
  • Whether a dietary supplement or an antacid was consumed in the past 24 hours 
  • Total number of supplements and antacids reported for that participant 
  • Daily aggregates of 34 nutrients/dietary components (listed in Appendix 2) from all supplements and antacids, as calculated using the NHANES-DSD. 

The food and beverage dietary intake are released in separate files available on the NHANES website. They can be linked to the dietary supplement files by the respondent sequence number (SEQN). 

 

Eligible Sample

All NHANES participants are eligible for the dietary supplement use component of the dietary interview component.

Protocol and Procedure

The examination protocol and data collection methods are fully documented in the NHANES dietary interviewer procedures manuals (In-person interview and phone follow-up interview).

The 24-hour dietary supplement use component was administered after the 24-hour dietary interview for food and beverage. Information was obtained on all vitamins, minerals, herbals, and other dietary supplements and non-prescription antacids that were consumed during a 24-hour time period (midnight to midnight), including the name and the amount of supplement or antacid taken. Non-prescription antacids were collected since a high percentage of these products contain calcium and/or magnesium. Participants’ were shown a hand card that lists examples of supplements and atacids (Appendix 4). For participants who reported taking a supplement or antacid in the last 30 days during the household interview, the supplements or antacids were imported from the household questionnaire. The Interviewer verified that each dietary supplement and non-prescription antacid reported during the household interview was consumed the day before the interview (midnight to midnight). Participants were also asked how much was taken. Then the interviewers collected any additional supplement or antacid that was taken that previous day that were not reported during the household interview.

Interviews were conducted for survey participants less than six years of age with a proxy, whom was generally the person most knowledgeable about the survey participant’s intake. Interviews of children aged 6 to 8, were conducted with a proxy and with the child present to assist in reporting intake information. Interviews of children aged 9 to 11, were conducted with the child and with the assistance of an adult familiar with the child’s intake. Dietary interviewers conducted interviews in English and Spanish. Translators were used to conduct interviews in other languages.

The in-person dietary interview was conducted in a private room in the NHANES mobile examination center (MEC). Telephone dietary interviews were collected 3 to 10 days following the MEC dietary interview but not on the same day of the week as the MEC interview. Any participant who did not have a telephone was given a toll-free number to call so that the interview could be conducted.

For additional information about the dietary interview component and related survey protocols, please go to the Survey Operations Manual, Consent Documents, Brochures.

Quality Assurance & Quality Control

All dietary interviewers were required to complete an intensive one-week training course and to conduct supervised practice interviews before working independently in the field. Retraining sessions were conducted annually to reinforce the proper protocols and technique.

Interviewers were monitored throughout the data collection period. Interviews were checked for completeness of the recalls, missing information, inconsistent reports, and unclear notes. Written notification and feedback were provided to the interviewers.

Trained nutritionists at NCHS reviewed incoming data and matched reported dietary supplement entries to known supplements from the in-house NCHS Product Label Database (PLD) where possible; sought additional product labels if feasible; assigned generic or default supplements as appropriate; transferred or removed products that were not considered dietary supplement (i.e., prescription medication, foods, beverages); and assigned matching codes/confidence codes to indicate the degree of matching certainty. All coding was reviewed by the NCHS project officer.

Data Processing and Editing

Matching reported dietary supplements to known products

Trained nutritionists, at NCHS, match the product names entered by the interviewer (including prescription dietary supplement, non-prescription dietary supplement and non-prescription antacid) to a known product when possible. NCHS nutritionists first determine if the product is in our in-house PLD. If it is, then the nutritionist verify whether the product label was entered into the system within the 2-year cycle of data collection. If the product label has not been entered into PLD, or the product label was entered before the beginning of the 2-year data collection cycle, NCHS nutritionists attempt to obtain a new product label. NCHS obtains labels for each dietary supplement or non-prescription antacid reported by participants from sources such as the manufacturer, distributor or retailer, the Internet, company catalogs, and the Physician’s Desk Reference (PDR). Nutritionists determine during processing whether or not the non-prescription antacids collected contain calcium and/or magnesium. Only non-prescription antacids containing calcium or magnesium are included in the present data files.

NCHS communicates with many major manufacturing company representatives to determine when various product re-formulations become available. Based upon manufacturer advice, we have used a lag time of 5 months after the new re-formulated product has hit the market and matched products to participants’ accordingly. Despite these precautions, there is no guarantee that the product taken by participants’ is matched to the correct formulation in our release files.

NCHS nutritionists attempt to find the exact product(s) reported by participants; however, this is done with varying degrees of precision. A “confidence code” (DS1MTCH and DS2MTCH, located in files DS1IDS_G and DS2IDS_G, respectively) accompanies each record to indicate the degree of matching certainty. The matches are: 1) Exact or near exact match; 2) Probable match; 3) Generic match; 4) Reasonable match; or 5) Default match. In some cases no match can be made with any certainty. These products are coded as “6, No match”. Products whose names were reported as “Refused” (DSDSUPP=7777) or “Don’t know” (DSDSUPP=9999) have matching codes of 7 and 9, respectively.

NCHS created generic and default dietary supplements and non-prescription antacids, which are also maintained in the PLD database. Generics are created in the database when we have information about a reported supplement such as strength of all ingredients, i.e. one which had no brand name. These were generally single ingredient supplements which included a strength (e.g. vitamin C 500 mg) or multiple vitamins and/or mineral supplements made by a private label manufacturer that was known to NCHS and for which we had a label with identical ingredients and strengths (e.g. brand X all-purpose multivitamin was reported, and we had a label for brand Y, made by the same manufacturer). When all ingredient strengths were not known, a default supplement was created in the database. Defaults were created for single ingredient and multiple ingredient supplements based on our own data of most frequently reported supplements of that type, based on the survey cycle in which the data was collected. Created default products and the actual products or strengths that were assigned to these defaults are listed in Appendix 5.

After the dietary supplement data is coded and matched to a product in our in-house database, various types of reviews were conducted to ensure the quality of the data. Interviewers’ comments are reviewed to ensure that they have been accounted for in coding. Decisions are made about how to code new or unusual dietary supplement products or unusual quantities or units reported by participants. Dietary supplements that could not be matched to items in the database are resolved by NCHS nutritionists.

Product information is released from the in-house PLD as the NHANES Dietary Supplement Database (NHANES-DSD) which contains detailed information on the dietary supplements and antacids reported by survey participants since NHANES 1999. The NHANES-DSD release consists of three datasets which contain information on products:
Dietary Supplement Product Information (DSPI)
Dietary Supplement Ingredient Information (DSII)
Dietary Supplement Blend Information (DSBI)
The supplement ID numbers (DSDSUPID) located in files DS1IDS_G and DS2IDS_G of this release can be used to merge with the NHANES-DSD files. For more information on the NHANES-DSD, please refer to the documentation and release files located on the NHANES website.

Specific variables and edits:

DSDSUPID: Supplement ID

Supplement ID is a 10-digit identifier assigned to each product entered into the PLD. All identifiable products have a supplement ID beginning with the number "1". The next 3 digits (positions 2-4) are: "888" or "881" if the supplement was created by NCHS as a generic or default product; otherwise the digits in positions 2-4 are coded "000" or "001". The next 4 digits (positions 5-8) are sequentially assigned by the system for each product. The last 2 digits (positions 9-10) indicate formulations of the same supplement: the first formulation entered into the database = 00, the first re-formulation = 01, the next = 02, etc. Note that these are reformulations of the same product. Different versions of products (e.g. liquid vs. tablet, with iron vs. without iron, regular vs. high potency) are considered as different products thus have different 4 digit numbers in positions 5 to 8. When a product name was entered as “no product information available” “refused” or “don’t know” its ID number starts with a string of 6’s.

DSDSUPP: Name of Supplement

This is the name from the front of the product label. The brand name is generally entered first (i.e. Nature’s Way) and then the actual product name (i.e. lutein). Information such as the strength (i.e. 60 mg extract) of the product and other qualifiers that help distinguish a product from a similar product (i.e. mega, super, high potency, time release, chewable, extract) are also listed if they are on the front of the product label. Words like “dietary supplement” and health claims are not entered as part of the name.

DS1ANTA (DS1IDS_G) and DS2ANTA (DS2IDS_G): variable indicates whether a product was a dietary supplement or non-prescription antacid

This variable indicates whether the product reported was a non-prescription antacids (code=1) or a dietary supplement (code=0).

DS1MTCH (DS1IDS_G) and DS2MTCH (DS2IDS_G): Match code/confidence code

Supplements are recorded during the dietary interview with varying degrees of accuracy and completeness. NCHS has created a system to specify how certain we are with matching a supplement recorded during the interview with the actual product label. Below describes how matches are made:

Exact or near exact match (DSDMTCH=1) indicates that this is the only product that could match this entry.

Probable match (DSDMTCH=2) indicates that the match is not exact, but knowledge of the company’s products strongly suggests that this is the only possible match choice. For example the entry may not specify strength or include words such as timed release, but no other options are available for this brand according to manufacturer or retailer information.

Generic match (DSDMTCH=3) indicates we had information on the strength for all ingredients, either a) as part of name (e.g. vitamin C 500 mg) or b) because the manufacturer is known and NCHS has an identical product made by this manufacturer for a different distributor or retailer. Thus the ingredients and amounts are considered to be accurate despite an exact brand match.

Reasonable match (DSDMTCH=4) indicates that the product name may be incomplete or could be complete but other products of this brand also start with these same words so this cannot be assured. In these cases, the entered name is matched to either: a) the most frequently reported of these products in the NHANES 2011-2012 data, if this could be determined; b) the best selling product by this company that matches the entered name; or c) the most basic product by this company, as assessed by label wording.

Default match (DSDMTCH=5) indicates that the exact product could not be obtained because the name was imprecise or the exact brand product could not be located and no generic could be assigned. In these cases, the entered product was matched to a created default product based upon: a) the most commonly reported strengths for single ingredients; b) the most commonly reported brands for major multiple ingredient products such as multivitamins and multivitamin/multiminerals for children, seniors, or adults, if available; or c) products manufactured by a large, private-label manufacturer.

Finally, a match codes of No match (DSDMTCH=6) indicates that no product could be found and there was not enough detail in the name to assign a generic or default match with any confidence. The words “no product information available” are listed as the product name (DSDSUPP).

Analysts should be aware that for default matches and matches that chose between several similarly named supplements, there is less certainty that the ingredients and ingredient amounts in the supplement assigned exactly match those in the supplement actually taken. Additionally, NCHS cannot guarantee in any case that the matched product was the exact product taken or even that any product actually was taken, as these data are self-reported.

DS1ACTSS (DS1IDS_G) and DS2ACTSS (DS2IDS_G): Reported serving size/label serving size

This variable was derived using the information from the 'Supplement Information' file (DSPI) of the NHANES-DSD and the participants’ reported amount taken. File  DSPI provides information on the serving size from the product label’s supplement facts panel for which the nutrient amounts were based on. The participant were asked to report the amount taken during the dietary interview. The reported amount taken was divided by the serving size amount from DSPI (variable DSDSERVQ). Prior to calculating, the data needed to be edited to standardize the unit the participant used to report the amount taken and the unit used in the product serving size label. For example, if a respondent reported taking 1 tablespoon of a supplement and the label serving size was 3 teaspoons, than the reported amount taken was edited as 3 teaspoons (1 tablespoon = 3 teaspoons). There were about 364 records in which data was edited. In most of the cases, using the alternative serving size (information available on some product labels), using simple conversions (i.e. teaspoons to tablespoons) or contacting the manufacturer for information on label serving size (i.e. actual amount for a “capful”) provided enough information to make clear edits. However, in some cases the reported amount taken was very different from the product label serving size. For example, the respondent may have reported 1 tablet, but the label serving size is 1 tablespoon. This was assumed to be an error in reporting or an interviewer data entry error. In these cases the serving size was assumed to be the label serving size.  Additionally, all records that were assigned as a default product were edited and the label serving size was assigned.

Nutient variables from Individual Dietary Supplements files, DS1IDS_G and DS2IDS_G

These variables are created by using files from the NHANES_DSD that contain information on the serving size and the quantity of each nutrient from the product label’s supplement facts panel. The participants reported amount taken is divided by the serving size from the label in order to determine the actual amount of nutrient consumed. For example, a participant may report taking one tablet, but the serving size amount is 2 tablets. Therefore, only half of the nutrients on the label are being consumed. The variables DS1ACTSS (Day 1) and DS2ACTSS (Day 2) indicate the actual amount of product that was consumed. The actual amount of product consumed is then multiplied by the ingredient amount for each dietary supplement or antacid. In the example above, 0.5 would be multiplied by each ingredient/nutrient, to estimate the nutrient intake.

DS1IFDFE (DS1IDS_G) and DS1IFDFE (DS2IDS_G): Folate, DFE (mcg)
Dietary Folate Equivalents (DFE) were calculated by using a conversion factor of 1.7. This conversion is based on recommendations set by the Institute of Medicines Dietary Reference Intakes.(3)

Nutient variables from Total Dietary Supplements files, DS1TOT_G and DS2TOT_G

These variables are created by adding up each nutrient for each participant from the Individual Dietary Supplements Files (DS1IDS_G and DS2IDS_G).

Analytic Notes

In some cases it may appear as though a participant reported the same dietary supplement more than once. There are a several reasons for these duplications. Participants’ may have reported different brand name dietary supplements which when collected had the same generic ingredient (i.e. 2 different brands of calcium, but calcium is collected generically with only the strength recorded) or the dietary supplement may have been different forms or dosages of the same product. There were a few cases where the respondent did report the exact same dietary supplement, with the same length of use, frequency of use or amount used. In these cases, since the interviewer recorded the dietary supplement separately, both mentions were retained in the file.

During the data editing process, outlier values were examined. When there was insufficient information to conclude that values were invalid, they were left in the data set. Analysts should examine the distribution of the data and consider whether or not it is appropriate to include or exclude extreme values in a given analysis.

Each Individual Dietary Supplements File (DS1IDS_G and DS2IDS_G) is comprised of dietary supplement and non-prescription antacid records. Only participants who reported taking a dietary supplement or non-prescription antacid are included in these files. For many survey participants, there are multiple records in each file. For each Total Dietary Supplements File (DS1TOT_G and DS2TOT_G), there is one record for each participant and includes the entire dietary interview sample. These files can be linked with other NHANES files by the respondent sequence number (SEQN).

Variable names: For data collected on both Day 1 and Day 2, variable names are differentiated by having the number “1” or “2” in the third position of the variable name to identify the collection day. For example, the calcium variable in the Individual Dietary Supplements File, which identifies the amount of calcium in each supplement reported by the participant, is named DS1ICALC in the Day 1 file and DS2ICALC in the Day 2 file. Appendices 1 and 3 list the Day 1 and Day 2 variable names for the Individual Dietary Supplements files and the Total Dietary Supplements files, respectively.

Names for the following variables are the same for both days in the Individual Dietary Supplements files and the Total Dietary Supplements files:

Variables with the Same Name for Both Days in the Dietary Supplements Files
Day 1 and Day 2 variable name Label
SEQN Respondent sequence number
WTDRD1 Dietary day one sample weight
WTDR2D Dietary two-day sample weight
DSDSUPID Supplement ID
DRDINT Number of days of intake

Number of days of intake: Because two days of data are included in the 2011-2012 release, a variable has been included to indicate the number of days of intake available for each participant. The variable name is DRDINT.  For 2011-2012, 8519 respondents provided complete dietary intakes for Day 1. Of those providing the Day 1 data, 7,605 provided complete dietary intakes for Day 2.

Dietary recall status code: A status code (DR1DRSTZ or DR2DRSTZ) is used in both the Individual Dietary Supplements and Total Dietary Supplements files to indicate the quality and completeness of a survey participant's response to the dietary recall section. These codes are based on the food 24-hour dietary recall interview data. The codes are the following: 1. reliable and met the minimum criteria, 2. Not reliable or did not meet the minimum criteria, 4. Reported consuming breast milk, and 5. Not done. Although there are four possible values, only codes 1 and 4 appear in the Individual Dietary Supplements Files. For more information on this variable, refer to the documentations accompanying the 24-hour dietary interview datasets for food and beverage intake on the NHANES website.

Sample weights for dietary intake data: NHANES participants were selected on the basis of a national probability design. In order to increase the number of participants for specific demographic groups, a multi-stage, unequal probability of selection design was implemented. In 2011-2012, the sample design included an oversample of Asian Americans.

Sample weights are constructed that encompass the unequal probabilities of selection, as well as adjustments for non-participation by selected participants. In order to produce national, representative estimates, the appropriate sample weights must be used.

In 2011-2012, there were 13,431 persons selected; of these 9,338 were considered respondents to the MEC examination and data collection. 8,519 of the MEC respondents provided complete dietary intakes for Day 1 and of those providing the Day 1 data, 7,605 provided complete dietary intakes for Day 2.

Most analyses of NHANES data use data collected in the MEC and the variable WTMEC2YR should be used for the sample weights. However, for the WWEIA dietary data, different sample weights are recommended for analysis. Although attempts are made to schedule MEC exams uniformly throughout the week, proportionally more exams occur on weekend days than on weekdays. Because food intake can vary by day of the week, use of the MEC weights would disproportionately represent intakes on weekends.

A set of weights (WTDRD1) is provided that should be used when an analysis uses the Day 1 dietary recall data (either alone or when Day 1 nutrient data are used in conjunction with MEC data). The set of weights (WTDRD1) is applicable to the 8,519 respondents with Day 1 data. Day 1 weights were constructed by taking the MEC sample weights (WTMEC2YR) and further adjusting for (a) the additional non-response and (b) the differential allocation by day of the week for the dietary intake data collection. These Day 1 weights are more variable than the MEC weights, and the sample size is smaller, so estimated standard errors using Day 1 data and Day 1 weights are larger than standard errors for similar estimates based on MEC weights.

When analysis is based on both days of dietary intake, only 7,605 participants have complete data. The NHANES protocol requires an attempt to collect the second day of dietary data at least 3 days after the first day, but the actual number of days between the two interviews is variable. A set of adjusted weights, WTDR2D, is to be used only when an analysis uses both Day 1 and Day 2 dietary data. This two-day weight was constructed for the 7,605 respondents by taking the Day 1 weights (WTDRD1) and further adjusting for (a) the additional non-response for the second recall and (b) for the proportion of weekend-weekday combinations of Day 1 and Day 2 recall.

Note that all sample weights are person-level weights and each set of dietary weights should sum to the same population control total as the MEC weights (WTMEC2YR). In addition, the MEC weights (WTMEC2YR) are appropriate for use in the analysis of the fish and shellfish consumption data (i.e., variables DRD340, DRD350A-K, DRD350AQ-JQ DRD360, DRD370A-V, and DRD370AQ-UQ) located in the Day 1 Total Nutrient Intake File (DR1TOT_G), if no other dietary data are included in the analysis. Additional explanation of sample weights and appropriate uses are included in the NHANES Analytic Guidelines. Please also refer to the on-line NHANES Tutorial for further details on other analytic issues. 

References

Codebook and Frequencies

SEQN - Respondent sequence number

Variable Name:
SEQN
SAS Label:
Respondent sequence number
English Text:
Respondent sequence number.
Target:
Both males and females 0 YEARS - 150 YEARS

WTDRD1 - Dietary day one sample weight

Variable Name:
WTDRD1
SAS Label:
Dietary day one sample weight
English Text:
Dietary day one sample weight
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1852.3028731 to 443805.73786 Range of Values 8519 8519
. Missing 819 9338

WTDR2D - Dietary two-day sample weight

Variable Name:
WTDR2D
SAS Label:
Dietary two-day sample weight
English Text:
Dietary two-day sample weight
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1531.3308619 to 499271.52935 Range of Values 7605 7605
. Missing 1733 9338

DR2DRSTZ - Dietary recall status

Variable Name:
DR2DRSTZ
SAS Label:
Dietary recall status
English Text:
Dietary recall status
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Reliable and met the minimum criteria 7496 7496
2 Not reliable or not met the minimum criteria 56 7552
4 Reported consuming breast-milk 109 7661
5 Not done 1677 9338
. Missing 0 9338

DR2EXMER - Interviewer ID code

Variable Name:
DR2EXMER
SAS Label:
Interviewer ID code
English Text:
Interviewer ID code
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
32 to 92 Range of Values 7661 7661
. Missing 1677 9338

DRDINT - Number of days of intake

Variable Name:
DRDINT
SAS Label:
Number of days of intake
English Text:
Indicates whether the sample person has intake data for one or two days.
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Day 1 only 914 914
2 Day 1 and day 2 7605 8519
. Missing 819 9338

DR2DBIH - # of days b/w intake and HH interview

Variable Name:
DR2DBIH
SAS Label:
# of days b/w intake and HH interview
English Text:
# of days b/w intake and HH interview
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
-38 to 178 Range of Values 7638 7638
. Missing 1700 9338

DR2DAY - Intake day of the week

Variable Name:
DR2DAY
SAS Label:
Intake day of the week
English Text:
Intake day of the week
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sunday 1257 1257
2 Monday 1556 2813
3 Tuesday 1455 4268
4 Wednesday 1771 6039
5 Thursday 726 6765
6 Friday 716 7481
7 Saturday 180 7661
. Missing 1677 9338

DR2LANG - Language respondent used mostly

Variable Name:
DR2LANG
SAS Label:
Language respondent used mostly
English Text:
The respondent spoke mostly:
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
5 to 6 Range of Values 98 98
1 English 6813 6911
2 Spanish 769 7680
3 English and Spanish 75 7755
4 Other 2 7757
. Missing 1581 9338

DR2MNRSP - Main respondent for this interview

Variable Name:
DR2MNRSP
SAS Label:
Main respondent for this interview
English Text:
Who was the main respondent for this interview?
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 SP 5436 5436
2 Mother of SP 1807 7243
3 Father of SP 182 7425
4 Wife of SP 30 7455
5 Husband of SP 6 7461
6 Daughter of SP 35 7496
7 Son of SP 10 7506
8 Grandparent of SP 42 7548
9 Friend, Partner, Non Relative 5 7553
10 Translator, not a HH member 1 7554
11 Child care provider, Caretaker 10 7564
12 Other Relative 40 7604
13 Other specify 0 7604
77 Refused 0 7604
99 Don't know 0 7604
. Missing 1734 9338

DR2HELPD - Helped in responding for this interview

Variable Name:
DR2HELPD
SAS Label:
Helped in responding for this interview
English Text:
Who helped in responding for this interview
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 SP 270 270
2 Mother of SP 198 468
3 Father of SP 32 500
4 Wife of SP 83 583
5 Husband of SP 17 600
6 Daughter of SP 7 607
7 Son of SP 2 609
8 Grandparent of SP 5 614
9 Friend, Partner, Non Relative 3 617
10 Translator, not a HH member 4 621
11 Child care provider, Caretaker 6 627
12 Other Relative 24 651
13 No one 6935 7586
14 Other specify 0 7586
77 Refused 0 7586
99 Don't know 2 7588
. Missing 1750 9338

DS2DSCNT - Total # of Dietary Supplements Taken

Variable Name:
DS2DSCNT
SAS Label:
Total # of Dietary Supplements Taken
English Text:
Total # of Dietary Supplements Taken
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 to 16 Range of Values 7597 7597
. Missing 1741 9338

DS2DS - Any Dietary Supplements Taken?

Variable Name:
DS2DS
SAS Label:
Any Dietary Supplements Taken?
English Text:
Any Dietary Supplements taken in the past 24 hour?
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 2589 2589
2 No 5008 7597
7 Refused 0 7597
9 Don't know 0 7597
. Missing 1741 9338

DS2ANCNT - Total # of Antacids Taken

Variable Name:
DS2ANCNT
SAS Label:
Total # of Antacids Taken
English Text:
Total # of Antacids Taken
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 to 2 Range of Values 7596 7596
. Missing 1742 9338

DS2AN - Any Antacids Taken?

Variable Name:
DS2AN
SAS Label:
Any Antacids Taken?
English Text:
Any Antacids Taken?
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 118 118
2 No 7478 7596
7 Refused 0 7596
9 Don't know 0 7596
. Missing 1742 9338

DS2TKCAL - Energy (kcal)

Variable Name:
DS2TKCAL
SAS Label:
Energy (kcal)
English Text:
Energy (kcal)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 to 520 Range of Values 1064 1064
. Missing 8274 9338

DS2TPROT - Protein (gm)

Variable Name:
DS2TPROT
SAS Label:
Protein (gm)
English Text:
Protein (gm)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.17 to 80 Range of Values 135 135
. Missing 9203 9338

DS2TCARB - Carbohydrate (gm)

Variable Name:
DS2TCARB
SAS Label:
Carbohydrate (gm)
English Text:
Carbohydrate (gm)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.15 to 42 Range of Values 878 878
. Missing 8460 9338

DS2TSUGR - Total sugars (gm)

Variable Name:
DS2TSUGR
SAS Label:
Total sugars (gm)
English Text:
Total sugars (gm)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.2 to 14 Range of Values 494 494
. Missing 8844 9338

DS2TFIBE - Dietary fiber (gm)

Variable Name:
DS2TFIBE
SAS Label:
Dietary fiber (gm)
English Text:
Dietary fiber (gm)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.3 to 30 Range of Values 93 93
. Missing 9245 9338

DS2TTFAT - Total fat (gm)

Variable Name:
DS2TTFAT
SAS Label:
Total fat (gm)
English Text:
Total fat (gm)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.35 to 18 Range of Values 559 559
. Missing 8779 9338

DS2TSFAT - Total saturated fatty acids (gm)

Variable Name:
DS2TSFAT
SAS Label:
Total saturated fatty acids (gm)
English Text:
Total saturated fatty acids (gm)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.023 to 6 Range of Values 141 141
. Missing 9197 9338

DS2TMFAT - Total monounsaturated fatty acids (gm)

Variable Name:
DS2TMFAT
SAS Label:
Total monounsaturated fatty acids (gm)
English Text:
Total monounsaturated fatty acids (gm)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.025 to 6 Range of Values 57 57
. Missing 9281 9338

DS2TPFAT - Total polyunsaturated fatty acids (gm)

Variable Name:
DS2TPFAT
SAS Label:
Total polyunsaturated fatty acids (gm)
English Text:
Total polyunsaturated fatty acids (gm)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.231 to 10 Range of Values 239 239
. Missing 9099 9338

DS2TCHOL - Cholesterol (mg)

Variable Name:
DS2TCHOL
SAS Label:
Cholesterol (mg)
English Text:
Cholesterol (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 to 160 Range of Values 318 318
. Missing 9020 9338

DS2TLYCO - Lycopene (mcg)

Variable Name:
DS2TLYCO
SAS Label:
Lycopene (mcg)
English Text:
Lycopene (mcg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
100 to 30000 Range of Values 435 435
. Missing 8903 9338

DS2TLZ - Lutein + zeaxanthin (mcg)

Variable Name:
DS2TLZ
SAS Label:
Lutein + zeaxanthin (mcg)
English Text:
Lutein + zeaxanthin (mcg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
5 to 95475 Range of Values 392 392
. Missing 8946 9338

DS2TVB1 - Thiamin (Vitamin B1) (mg)

Variable Name:
DS2TVB1
SAS Label:
Thiamin (Vitamin B1) (mg)
English Text:
Thiamin (Vitamin B1) (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.066 to 1500 Range of Values 1349 1349
. Missing 7989 9338

DS2TVB2 - Riboflavin (Vitamin B2) (mg)

Variable Name:
DS2TVB2
SAS Label:
Riboflavin (Vitamin B2) (mg)
English Text:
Riboflavin (Vitamin B2) (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.066 to 200 Range of Values 1355 1355
. Missing 7983 9338

DS2TNIAC - Niacin (mg)

Variable Name:
DS2TNIAC
SAS Label:
Niacin (mg)
English Text:
Niacin (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.825 to 2450 Range of Values 1391 1391
. Missing 7947 9338

DS2TVB6 - Vitamin B6 (mg)

Variable Name:
DS2TVB6
SAS Label:
Vitamin B6 (mg)
English Text:
Vitamin B6 (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.02 to 300 Range of Values 1654 1654
. Missing 7684 9338

DS2TVB12 - Vitamin B12 (mcg)

Variable Name:
DS2TVB12
SAS Label:
Vitamin B12 (mcg)
English Text:
Vitamin B12 (mcg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.73 to 5050 Range of Values 1734 1734
. Missing 7604 9338

DS2TFA - Folic acid (mcg)

Variable Name:
DS2TFA
SAS Label:
Folic acid (mcg)
English Text:
Folic acid (mcg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2 to 6300 Range of Values 1630 1630
. Missing 7708 9338

DS2TFDFE - Folate, DFE (mcg)

Variable Name:
DS2TFDFE
SAS Label:
Folate, DFE (mcg)
English Text:
Folate, DFE (mcg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
3 to 10710 Range of Values 1630 1630
. Missing 7708 9338

DS2TCHL - Total choline (mg)

Variable Name:
DS2TCHL
SAS Label:
Total choline (mg)
English Text:
Total choline (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.005 to 414 Range of Values 517 517
. Missing 8821 9338

DS2TVC - Vitamin C (mg)

Variable Name:
DS2TVC
SAS Label:
Vitamin C (mg)
English Text:
Vitamin C (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.3 to 15300 Range of Values 1822 1822
. Missing 7516 9338

DS2TVK - Vitamin K (mcg)

Variable Name:
DS2TVK
SAS Label:
Vitamin K (mcg)
English Text:
Vitamin K (mcg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2.5 to 2000 Range of Values 871 871
. Missing 8467 9338

DS2TVD - Vitamin D (D2 + D3) (mcg)

Variable Name:
DS2TVD
SAS Label:
Vitamin D (D2 + D3) (mcg)
English Text:
Vitamin D (D2 + D3) (mcg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.63 to 1270 Range of Values 2030 2030
. Missing 7308 9338

DS2TCALC - Calcium (mg)

Variable Name:
DS2TCALC
SAS Label:
Calcium (mg)
English Text:
Calcium (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
3 to 2720 Range of Values 1557 1557
. Missing 7781 9338

DS2TPHOS - Phosphorus (mg)

Variable Name:
DS2TPHOS
SAS Label:
Phosphorus (mg)
English Text:
Phosphorus (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
11.5 to 760 Range of Values 739 739
. Missing 8599 9338

DS2TMAGN - Magnesium (mg)

Variable Name:
DS2TMAGN
SAS Label:
Magnesium (mg)
English Text:
Magnesium (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.5 to 2910 Range of Values 1250 1250
. Missing 8088 9338

DS2TIRON - Iron (mg)

Variable Name:
DS2TIRON
SAS Label:
Iron (mg)
English Text:
Iron (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.0004 to 217.2 Range of Values 888 888
. Missing 8450 9338

DS2TZINC - Zinc (mg)

Variable Name:
DS2TZINC
SAS Label:
Zinc (mg)
English Text:
Zinc (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.2 to 132 Range of Values 1502 1502
. Missing 7836 9338

DS2TCOPP - Copper (mg)

Variable Name:
DS2TCOPP
SAS Label:
Copper (mg)
English Text:
Copper (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.001 to 15 Range of Values 1152 1152
. Missing 8186 9338

DS2TSODI - Sodium (mg)

Variable Name:
DS2TSODI
SAS Label:
Sodium (mg)
English Text:
Sodium (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 to 360 Range of Values 485 485
. Missing 8853 9338

DS2TPOTA - Potassium (mg)

Variable Name:
DS2TPOTA
SAS Label:
Potassium (mg)
English Text:
Potassium (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.05 to 1050 Range of Values 689 689
. Missing 8649 9338

DS2TSELE - Selenium (mcg)

Variable Name:
DS2TSELE
SAS Label:
Selenium (mcg)
English Text:
Selenium (mcg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.2 to 100000 Range of Values 941 941
. Missing 8397 9338

DS2TCAFF - Caffeine (mg)

Variable Name:
DS2TCAFF
SAS Label:
Caffeine (mg)
English Text:
Caffeine (mg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
70 to 400 Range of Values 12 12
. Missing 9326 9338

DS2TIODI - Iodine (mcg)

Variable Name:
DS2TIODI
SAS Label:
Iodine (mcg)
English Text:
Iodine (mcg)
Target:
Both males and females 0 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
3.75 to 12575 Range of Values 1149 1149
. Missing 8189 9338

Appendix 1. Variables in the Individual Dietary Supplements Files (DS1IDS_G and DS2IDS_G) by Position

Day 1 Name Day 2 Name Variable Label
(DS1IDS_G) (DS2IDS_G)
SEQN SEQN Respondent sequence number
WTDRD1 WTDRD1 Dietary day one sample weight
WTDR2D WTDR2D Dietary two-day sample weight
DR1DRSTZ DR2DRSTZ Dietary recall status
DR1EXMER DR2EXMER Interviewer ID code
DRDINT DRDINT Number of days of intake
DS1DAY DS2DAY Intake day of the week
DS1LOC DS2LOC Location supplement originally recorded
DR1LANG DR2LANG Language respondent used mostly
DSDSUPID DSDSUPID NCHS Supplement ID
DS1ANTA DS2ANTA Antacid containing calcium/magnesium
DS1MTCH     DS2MTCH     Match code/confidence code
DS1ACTSS DS2ACTSS Reported serving size/label serving size
DS1IKCAL DS2IKCAL Energy (kcal)
DS1IPROT DS2IPROT Protein (gm)
DS1ICARB DS2ICARB Carbohydrate (gm)
DS1ISUGR DS2ISUGR Total sugars (gm)
DS1IFIBE DS2IFIBE Dietary fiber (gm)
DS1ITFAT DS2ITFAT Total fat (gm)
DS1ISFAT DS2ISFAT Total saturated fatty acids (gm)
DS1IMFAT DS2IMFAT Total monounsaturated fatty acids (gm)
DS1IPFAT DS2IPFAT Total polyunsaturated fatty acids (gm)
DS1ICHOL DS2ICHOL Cholesterol (mg)
DS1ILYCO DS2ILYCO Lycopene (mcg)
DS1ILZ DS2ILZ Lutein + zeaxanthin (mcg)
DS1IVB1 DS2IVB1 Thiamin (Vitamin B1) (mg)
DS1IVB2 DS2IVB2 Riboflavin (Vitamin B2) (mg)
DS1INIAC DS2INIAC Niacin (mg)
DS1IVB6 DS2IVB6 Vitamin B6 (mg)
DS1IFA DS2IFA Folic acid (mcg)
DS1IFDFE DS2IFDFE Folate, DFE (mcg)
DS1ICHL DS2ICHL Total choline (mg)
DS1IVB12 DS2IVB12 Vitamin B12 (mcg)
DS1IVC DS2IVC Vitamin C (mg)
DS1IVK DS2IVK Vitamin K (mcg)
DS1IVD DS2IVD Vitamin D (D2 + D3) (mcg)
DS1ICALC DS2ICALC Calcium (mg)
DS1IPHOS DS2IPHOS Phosphorus (mg)
DS1IMAGN DS2IMAGN Magnesium (mg)
DS1IIRON DS2IIRON Iron (mg)
DS1IZINC DS2IZINC Zinc (mg)
DS1ICOPP DS2ICOPP Copper (mg)
DS1ISODI DS2ISODI Sodium (mg)
DS1IPOTA DS2IPOTA Potassium (mg)
DS1ISELE DS2ISELE Selenium (mcg)
DS1ICAFF DS2ICAFF Caffeine (mg)
DS1IIODI DS2IIODI Iodine (mcg)

Appendix 2. List of Nutrients/Food Components (Unit)

Energy and Macronutrients
Food energy (kcal) €
Protein (g) €
Carbohydrate (g) €
Fat, total (g) €
Alcohol (g)

Sugars, total (g) €
Dietary fiber, total (g) €
Water (moisture) (g)*

Saturated fatty acids, total (g) €
Monounsaturated fatty acids, total (g) €
Polyunsaturated fatty acids, total (g) €
Cholesterol (mg) €

Individual fatty acids:
4:0 (g)
6:0 (g)
8:0 (g)
10:0 (g)
12:0 (g)
14:0 (g)
16:0 (g)
18:0 (g)
16:1 (g)
18:1 (g)
20:1 (g)
22:1 (g)
18:2 (g)
18:3 (g)
18:4 (g)
20:4 (g)
20:5 n-3 (g)
22:5 n-3 (g)
22:6 n-3 (g)

Vitamins, Minerals, and Other Components Vitamin A as retinol activity equivalents (µg) ¥
Retinol (µg) ¥
Carotenoids:
Carotene, alpha (µg) ¥
Carotene, beta (µg) ¥
Cryptoxanthin, beta (µg) ¥
Lycopene (µg) €
Lutein + zeaxanthin (µg) €
Vitamin E as alpha-tocopherol (mg) ¥
Added vitamin E as alpha-tocopherol (mg)
Vitamin D (D2 + D3) (µg) €
Vitamin K as phylloquinone (µg) €
Vitamin C (mg) €
Thiamin (mg) €
Riboflavin (mg) €
Niacin (mg) €
Vitamin B-6 (mg) €
Folate, total (µg)
Folate as dietary folate equivalents (µg) €
Folic acid (µg) €
Food folate (µg)
Choline, total (mg) €
Vitamin B-12 (µg) €
Added vitamin B-12 (µg)

Calcium (mg) €
Iron (mg) €
Magnesium (mg) €
Phosphorus (mg) €
Potassium (mg) €
Sodium (mg) €
Zinc (mg) €
Copper (mg) €
Selenium (µg) €
Caffeine (mg) €
Theobromine (mg)
Iodine (mcg)†

* Value reflects moisture present in all foods, beverages, and water consumed as a beverage (variables DR1IMOIS, DR2IMOIS, DR1TMOIS, DR2TMOIS)
€Indicates nutrients in which data is available for dietary supplements and non-prescription antacids containing calcium and/or magnesium
¥Indicates that data will be available in a later release cycle

†Only available in the dietary supplement files

Appendix 3. Variables in the Total Dietary Supplements Files (DS1TOT_G and DS2TOT_G) by Position

Day 1 Name Day 2 Name Variable Label
(DS1TOT_ G) (DS2TOT_ G)
SEQN SEQN Respondent sequence number
WTDRD1 WTDRD1 Dietary day one sample weight
WTDR2D WTDR2D Dietary two-day sample weight
DR1DRSTZ DR2DRSTZ Dietary recall status
DR1EXMER DR2EXMER Interviewer ID code
DRDINT DRDINT Number of days of intake
DS1DAY DS2DAY Intake day of the week
DR1LANG DR2LANG Language respondent used mostly
DR1MNRSP DR2MNRSP Main respondent for this interview
DR1HELPD DR2HELPD Helped in responding for this interview
DS1DS DS2DS Any Dietary Supplements taken in the past 24 hour?
DS1DSCNT DS2DSCNT Number of dietary supplements reported
DS1AN DS2AN Any Antacids Taken?
DS1ANCNT DS2ANCNT Number of Antacids Reported
DS1TKCAL DS2TKCAL Energy (kcal)
DS1TPROT DS2TPROT Protein (gm)
DS1TCARB DS2TCARB Carbohydrate (gm)
DS1TSUGR DS2TSUGR Total sugars (gm)
DS1TFIBE DS2TFIBE Dietary fiber (gm)
DS1TTFAT DS2TTFAT Total fat (gm)
DS1TSFAT DS2TSFAT Total saturated fatty acids (gm)
DS1TMFAT DS2TMFAT Total monounsaturated fatty acids (gm)
DS1TPFAT DS2TPFAT Total polyunsaturated fatty acids (gm)
DS1TCHOL DS2TCHOL Cholesterol (mg)
DS1TLYCO DS2TLYCO Lycopene (mcg)
DS1TLZ DS2TLZ Lutein + zeaxanthin (mcg)
DS1TVB1 DS2TVB1 Thiamin (Vitamin B1) (mg)
DS1TVB2 DS2TVB2 Riboflavin (Vitamin B2) (mg)
DS1TNIAC DS2TNIAC Niacin (mg)
DS1TVB6 DS2TVB6 Vitamin B6 (mg)
DS1TFA DS2TFA Folic acid (mcg)
DS1TFDFE DS2TFDFE Folate, DFE (mcg)
DS1TVB12  DS2TVB12 Vitamin B12 (mcg)
DS1TCHL DS2TCHL Total choline (mg)
DS1TVC DS2TVC Vitamin C (mg)
DS1TVK DS2TVK Vitamin K (mcg)
DS1TVD DS2TVD Vitamin D (D2 + D3) (mcg)
DS1TCALC DS2TCALC Calcium (mg)
DS1TPHOS DS2TPHOS Phosphorus (mg)
DS1TMAGN DS2TMAGN Magnesium (mg)
DS1TIRON DS2TIRON Iron (mg)
DS1TZINC DS2TZINC Zinc (mg)
DS1TCOPP DS2TCOPP Copper (mg)
DS1TSODI DS2TSODI Sodium (mg)
DS1TPOTA DS2TPOTA Potassium (mg)
DS1TSELE DS2TSELE Selenium (mcg)
DS1TCAFF DS2TCAFF Caffeine (mg)
DS1TIODI DS2TIODI Iodine (mcg)

Appendix 4: Dietary Supplement Handcard

VITAMINS

MINERALS

Calcium, Vitamin C, Calcium and Iron, Vitamin E, Magnesium, Zinc, Calcium plus Vitamin D
MULTI-VITAMIN--MULTI-MINERALS Flintstones, One a Day, Prenatals, Tri-Vi-Flor, B-Complex, Centrum
HERBALS AND BOTANICLAS Echinacea, Garlic, Saw Palmetto, Ginkgo, Ginseng
FIBER Metamucil, Fibercon, Benefiber
AMINO ACIDS Lysine, Methionine, Tryptophan
OTHERS Fish Oil, Chondrotin, Glucosamine

Appendix 5: Created Default Supplements and Antacids

Default Supplement Assigned Strength or Supplement Selection of Assigned Strength or Supplement Based On:
5-HTP (5-Hydroxytryptophan) 50 mg Commonly Available Strength
Acai 500 mg Commonly Available Strength
Acetyl L-Carnitine 500 mg Commonly Available Strength
Alpha-Lipoic Acid 100 mg Commonly Available Strength
Apple Cider Vinegar Tablets 600 mg Commonly Available Strength
B 50 B-Complex Perrigo Balanced B50 B- Complex Vitamins Commonly Available Product
Balanced B 100 B-Complex Perrigo Balanced B 100 B-Complex Commonly Available Product
B-Complex With Vitamin C Nature Made Super B-Complex With Vitamin C & Folic Acid Commonly Available Product
Bee Pollen 500 mg Commonly Available Strength
Beta Carotene 25,000 IU Most Commonly Reported Strength
Biotin 5000 mcg Most Commonly Reported Strength
Black Cohosh 40 mg Most Commonly Reported Strength
Boron 3 mg Commonly Available Strength
Boswellin 250 mg Commonly Available Strength
Caffeine 200 mg Commonly Available Strength
Calcium 600 mg Most Commonly Reported Strength
Calcium & Magnesium Calcium 333 mg, Magnesium 133 mg Most Commonly Reported Strengths
Calcium & Magnesium 300 mg Calcium 600 mg, Magnesium 300 mg Most Commonly Reported Strengths
Calcium + Magnesium Liquid Calcium 1000 mg, Magnesium 500 mg Commonly Available Strengths
Calcium + Vitamin D 500 IU Calcium 630 mg, Vitamin D 500 IU Most Commonly Reported Strengths
Calcium + Vitamin D 600 IU Calcium 600 mg, Vitamin D 600 IU Most Commonly Reported Strengths
Calcium 1200 mg With Vitamin D Calcium 1200 mg, Vitamin D 1000 IU Most Commonly Reported Strengths
Calcium 250 mg + Magnesium Calcium 250 mg, Magnesium 250 mg Commonly Available Strengths
Calcium 400 mg With Vitamin D Calcium 400 mg, Vitamin D 500 IU Most Commonly Reported Strengths
Calcium 500 mg With Vitamin D Calcium 500 mg, Vitamin D 200 IU Most Commonly Reported Strengths
Calcium 600 mg With Vitamin D Calcium 600 mg, Vitamin D 400 IU Most Commonly Reported Strengths
Calcium 630 mg With Vitamin D Calcium 630 mg, Vitamin D 500 IU Most Commonly Reported Strengths
Calcium With Vitamin D Calcium 600 mg, Vitamin D 400 IU Most Commonly Reported Strengths
Calcium, Vitamin D & Magnesium Calcium 600 mg, Vitamin D 200 IU, Magnesium 200 mg Commonly Available Strengths
Cat’s Claw (Una De Gato) 500 mg Commonly Available Strength
Cayenne 455 mg Commonly Available Strength
Charcoal 260 mg Commonly Available Strength
Chaste Tree 400 mg Commonly Available Strength
Chewable Multivitamin With Fluoride Multi-Vitamin With Fluoride Chewable Tablets 0.25 Mg Multivitamin And Fluoride Qualitest Commonly Available Product
Children’s Multivitamin/Multimineral Flintstones Complete Children’s Multivitamin Most Commonly Reported Product
Children's Multivitamins Plus Iron Flintstones With Iron Children's Multivitamin Most Commonly Reported Product
Chlorella 500 mg Commonly Available Strength
Chromium 500 mcg Most Commonly Reported Strength
Cinnamon 500 mg Commonly Available Strength
Cod Liver Oil Liquid Carlson Norwegian Cod Liver Oil Commonly Available Product
Cod Liver Oil Softgels Finest Nutrition Cod Liver Oil 415 mg Commonly Available Product
Coenzyme Q-10 100 mg Most Commonly Reported Strength
Collagen 500 mg Commonly Available Strength
Colostrum 500 mg Commonly Available Strength
Cranberry 300 mg Most Commonly Reported Strength
Creatine Capsules 750 mg Most Commonly Reported Strength
Creatine Monohydrate 5000 mg (5 G) Most Commonly Reported Strength
DHA 100 mg Commonly Available Strength
DHEA 25 mg Most Commonly Reported Strength
Echinacea 400 mg Most Commonly Reported Strength
Echinacea & Goldenseal Mason Natural Echinacea & Goldenseal Commonly Available Product
Elderberry Liquid Nature's Way Original Sambucus Elderberry Standardized Extract Natural Syrup Commonly Available Product
Elderberry, Zinc & Echinacea Liquid Now Elderberry, Zinc & Echinacea Syrup Commonly Available Product
Enzymes Genuine N-Zimes Dr. Howell's Original Formula Commonly Available Product
Essential Fatty Acids Softgels Now Omega 3-6-9 Essential Fatty Acids 1000 mg Commonly Available Product
Evening Primrose Oil 1000 mg Most Commonly Reported Strength
Eye Multi-Vitamin And Mineral Bausch + Lomb PreserVision Eye Vitamin & Mineral AREDS Soft Gels Most Commonly Reported Product
Fiber Capsules Metamucil MultiHealth Fiber Psyllium Fiber Capsules Most Commonly Reported Product
Fiber Powder Metamucil MultiHealth Fiber Original Coarse Psyllium Fiber Powder Commonly Available Product
Fish Oil 1000 mg Most Commonly Reported Strength
Fish, Flax And Borage Oils Puritan's Pride Premium Maximum Strength Triple Omega 3-6-9 Fish, Flax & Borage Oils Commonly Available Product
Flax Seed Oil 1000 mg Most Commonly Reported Strength
Flaxseed And Fish Oil Twinlab Flax/Fish Combo Oil Commonly Available Product
Fluoride Tabs 0.5 mg Commonly Available Strength
Folic Acid 400 mcg Most Commonly Reported Strength
Folic Acid, Vitamin B-6, And Vitamin B-12 Folgard Commonly Available Product
Garlic 1000 mg Most Commonly Reported Strength
Ginkgo Biloba 120 mg Most Commonly Reported Strength
Ginseng 100 mg Most Commonly Reported Strength
Glucosamine 1000 mg Most Commonly Reported Strength
Glucosamine 1500 mg With MSM Glucosamine 1500 mg, MSM 1500 mg Commonly Available Strengths
Glucosamine Chondroitin CVS/Pharmacy Glucosamine Chondroitin Regular Strength Commonly Available Product
Glucosamine Chondroitin & MSM Spring Valley Glucosamine Chondroitin Plus MSM Commonly Available Product
Goldenseal 400 mg Commonly Available Strength
Green Coffee Bean 400 mg Commonly Available Strength
Grape Seed 100 mg Commonly Available Strength
Green Tea 315 mg Most Commonly Reported Strength
Gummy Adult Multivitamin / Multimineral One A Day VitaCraves Gummies Complete Adult Multivitamin Commonly Available Product
Gummy Bear Multivitamin L'il Critters Gummy Vites Most Commonly Reported Product
Gummy Omega-3 L'il Critters Omega-3 DHA Gummy Fish Most Commonly Reported Product
Hoodia Gordonii 250 mg Commonly Available Strength
Iron 65 mg Most Commonly Reported Strength
Korean Ginseng 100 mg Commonly Available Strength
Kre-Alkalyn 750 mg Commonly Available Strength
Krill Oil Schiff MegaRed 100% Pure Omega-3 Krill Oil 300 mg Most Commonly Reported Product
Lactobacillus Acidophilus 10 mg Commonly Available Strength
L-Arginine 500 mg Commonly Available Strength
L-Carnitine 500 mg Most Commonly Reported Strength
L-Taurine 500 mg Commonly Available Strength
Lecithin 1200 mg Most Commonly Reported Strength
Lecithin Granules GNC Soy Lecithin Granules Commonly Available Product
Liquid B Complex Nature's Bounty Sublingual Liquid B Complex With B12 Commonly Available Product
Liquid Calcium, Magnesium & Vitamin D Calcium 1200 mg, Magnesium 600 mg & Vitamin D 1000 IU Commonly Available Strengths
Liquid Fish Oil Carlson The Very Finest Fish Oil Omega-3's DHA & EPA Commonly Available Product
Liquid Flaxseed Oil Omega Nutrition Hi-Lignan Flax Oil Commonly Available Product
Liquid Vitamin B-12 1000 mcg Commonly Available Strength
Liquid Vitamin C 1000 mg Commonly Available Strength
Lutein 20 mg Commonly Available Strength
Lysine 500 mg Most Commonly Reported Strength
Magnesium 250 mg Most Commonly Reported Strength
Magnesium Liquid 250 mg Commonly Available Strength
Melatonin 3 mg Most Commonly Reported Strength
Men's 50+ Multivitamin / Multimineral One A Day Men's 50+ Multivitamin / Multimineral Most Commonly Reported Product
Men’s Multivitamin/Multimineral One A Day Men’s Health Formula Most Commonly Reported Product
Methionine 500 mg Commonly Available Strength
Milk Thistle 175 mg Most Commonly Reported Strength
Moringa 400 mg Commonly Available Strength
MSM 1000 mg Most Commonly Reported Strength
Multivitamin / Multimineral Centrum Multivitamin / Multimineral Adults Under 50 Most Commonly Reported Product
Multivitamin Multimineral Pack Kirkland Signature Daily Multi Pack Commonly Available Product
Multivitamin Plus Iron Perrigo Daily Multiple Vitamins Plus Iron Commonly Available Product
Myrrh Gum 550 mg Commonly Available Strength
Niacin (Vitamin B-3) 500 mg Most Commonly Reported Strength
Olive Leaf 500 mg Commonly Available Strength
Omega 3 Carlson Super Omega-3 Gems Fish Oil Concentrate 1000 mg Commonly Available Product
Pau D'Arco 500 mg Commonly Available Strength
Pediatric Iron Drops Enfamil Fer-In-Sol Iron Drops Commonly Available Product
Pediatric Vitamin D Drops Enfamil D-Vi-Sol Vitamin D Drops Commonly Available Product
Phosphatidylserine 100 mg Commonly Available Strength
Policosanol 10 mg Commonly Available Strength
Polyvitamin Chewable Tablets Enfamil Poly-Vi-Sol Multivitamin Chewable Tablets Commonly Available Product
Poly-Vitamin Drops Enfamil Poly-Vi-Sol Vitamin Drops Commonly Available Product
Potassium 99 mg Most Commonly Reported Strength
Prenatal Vitamins Stuart Prenatal Vitamins Commonly Available Product
Probiotic Shaklee Bifidus & Acidophilus Optiflora Probiotic Complex Commonly Available Product
Protein Powder Now Sports Premium Whey Protein Commonly Available Product
Psyllium Fiber Metamucil MultiHealth Fiber Original Coarse Psyllium Fiber Powder Commonly Available Product
Red Clover Nature's Way Red Clover Blossom & Herb Certified 400 mg Commonly Available Product
Red Ginseng Extract Liquid Red Ginseng Extract 80 ml Commonly Available Strength
Red Yeast Rice 600 mg Most Commonly Reported Strength
Resveratrol 100 mg Commonly Available Strength
Royal Jelly & Propolis Royal Jelly 300 mg, Propolis 200 mg Commonly Available Strengths
Salmon Oil Liquid Nordic Naturals Kenai Wild Alaskan Salmon Oil Commonly Available Product
Sam-E 200 mg Commonly Available Strength
Saw Palmetto 450 mg Most Commonly Reported Strength
Saw Palmetto, Pumpkin Seed Oil & Zinc Now Saw Palmetto Extract With Pumpkin Seed Oil & Zinc Commonly Available Product
Selenium 200 mcg Most Commonly Reported Strength
Senior Multivitamin / Multimineral Centrum Silver Multivitamin / Multimineral Adults 50+ Most Commonly Reported Product
Senna 450 mg Commonly Available Strength
Silica 35 mg Commonly Available Strength
Sodium Fluoride Drops 0.5 mg Commonly Available Strength
St. John’s Wort 300 mg Most Commonly Reported Strength
Stress Vitamins Perrigo Stress Formula Vitamins Commonly Available Product
Super B-Complex Nature Made Super B-Complex With Vitamin C & Folic Acid Commonly Available Product
Teen Multivitamin For Her One A Day Teen Advantage For Her Complete Multivitamin Most Commonly Reported Product
Teen Multivitamin For Him One A Day Teen Advantage For Him Complete Multivitamin Most Commonly Reported Product
Tri-Vitamin Drops Enfamil Tri-Vi-Sol Commonly Available Product
Tri-Vitamin With Fluoride Drops Enfamil Tri-Vi-Flor 0.25 Mg Vitamins A, D, C, And Fluoride Drops Commonly Available Product
Turmeric 500 mg Most Commonly Reported Strength
Virgin Coconut Oil 1000 mg Commonly Available Strength
Vitamin A 10,000 IU Most Commonly Reported Strength
Vitamin A & D Vitamin A 5000 IU, Vitamin D 400 IU Most Commonly Reported Strengths
Vitamin B-1 (Thiamin) 100 mg Most Commonly Reported Strength
Vitamin B-12 1000 mcg Most Commonly Reported Strength
Vitamin B-6 100 mg Most Commonly Reported Strength
Vitamin B-Complex GNC B-Complex 50 mg Commonly Available Product
Vitamin C 500 mg Most Commonly Reported Strength
Vitamin C Powder 1000 mg Commonly Available Strength
Vitamin D 1000 IU Most Commonly Reported Strength
Vitamin D Liquid 1000 IU Commonly Available Strength
Vitamin E 400 IU Most Commonly Reported Strength
Vitamin E & Selenium Vitamin E 400 IU, Selenium 50 mcg Commonly Available Strengths
Whey Protein Now Sports Premium Whey Protein Commonly Available Product
Women's Multivitamin / Multimineral One A Day Women's Formula Multivitamin / Multimineral Most Commonly Reported Product
Women's Ultra Multivitamin/Multimineral Caplets GNC Women's Ultra Mega Multivitamin Commonly Available Product
Zinc 50 mg Most Commonly Reported Strength
Zinc Liquid 15 mg Commonly Available Strength
Default Antacid Antacid Assigned Selection of Assigned Antacid Based On:
Default Antacid Liquid Maalox Advanced Regular Strength Antacid Liquid Commonly Available Product
Default Calcium Antacid Tums Regular Strength Commonly Available Product
Default Calcium Antacid Maximum Strength Tablets Tums Ultra Strength Commonly Available Product
Default Extra Strength Antacid Tablets Tums Extra Strength Commonly Available Product