National Health and Nutrition Examination Survey and National Youth Fitness Survey

NHANES/NYFS 2012 Data Documentation, Codebook, and Frequencies

NHANES/NNYFS Combined Sample 2012 - Diet Behavior & Nutrition (C_DBQ)

Data File: C_DBQ.xpt

First Published: February , 2015

Last Revised: NA

Locator Record

Title: NHANES/NNYFS Combined Sample 2012 - Diet Behavior & Nutrition (C_DBQ )
Contact Number: 1-866-441-NCHS
Years of Content: 2012
First Published: February , 2015
Revised: NA
Access Constraints: RDC Only
Use Constraints: RDC Only
Geographic Coverage: National
Subject: The DBQ section provides personal interview data on various dietary behavior and nutrition related topics, including school meal program participation, meals prepared away from home, fast food meals, use of convenience foods, etc.
Record Source: NHANES/NNYFS 2012
Survey Methodology: This is a stratified multistage probability sample of the non-institutionalized population aged 3 to 15 years in the U.S. from NHANES 2012 and NNYFS 2012.
Medium: NHANES Web site; SAS transport files

Component Description

This file provides data from the diet behavior and nutrition (variable name prefix DBQ) section for the combined samples from NHANES 2012 and the NHANES National Youth Fitness Survey (NNYFS).

This section provides personal interview data on various dietary behavior and nutrition related topics. Topics included in the section are:

• School meal program participation (4-15 yr)
• Frequency of getting meals prepared away from home (≥ 1 yr)
• Frequency of meals got from fast-food or pizza places (≥ 1 yr)
• Use of convenience foods (≥ 1 yr)

This dataset can only be accessed through the NCHS Research Data Center (RDC). Instructions for requesting use of these data are available at the RDC website (http://www.cdc.gov/rdc/).

Eligible Sample

The target age groups for questions in this section vary by the topic. For example, the questions pertaining to school meal program participation were asked for children and adolescents aged 4 to 15 years; and the use of convenience foods questions were asked for all participants one year of age and older. Please review the questionnaire and codebook carefully. Frequency counts were verified during the preparation of the file.

Interview Setting and Mode of Administration

These questions were asked, in the home, by trained interviewers using the Computer-Assisted Personal Interviewing (CAPI) system. A proxy provided information for all survey participants.

Hand cards showing response categories were also used for some questions. When necessary, the interviewers read the hand cards to respondents.

Quality Assurance & Quality Control

The CAPI system is programmed with built-in consistency checks to reduce data entry errors. CAPI also uses online help screens to assist interviewers in defining key terms used in the questionnaire. All of the data was reviewed by the NHANES field office staff for accuracy and completeness.

Data Processing and Editing

Frequency counts were checked, "skip" patterns were verified, and the reasonableness of question responses was reviewed. Edits were made to some variables to ensure the completeness, consistency, and analytic usefulness of the data. Edits were also made, when necessary, to address data disclosure concerns. When a variable was modified globally, as part of the editing process, the third letter in the variable name was changed from a Q (i.e., DBQ) to a D (i.e., DBD). For example, some data were collected using two variables (a number variable and a unit of measure variable), but combined into a single variable for data release purposes.

DBD895 (Frequency of getting meals prepared away from home)
Respondents were asked how many times they had gotten meals that were prepared away from home in the past 7 days. If the frequency was reported as "never," the value was re-coded as zero. If the frequency was reported more than 21 times per week, the value was re-coded as "5555".

DBD900 (Frequency of getting meals from fast food or pizza places)
Respondents were asked how many times they had gotten meals from fast food or pizza places in the past 7 days. If the frequency was reported as "never," the value was re-coded as zero. If the frequency was reported more than 21 times per week, the value was re-coded as "5555".

DBD905 and DBD910 (Use of convenience foods)

This information was collected using two-part (number and unit) questions to allow respondents to report the frequency of interest as either per day, per week, or per month. The released variables were edited to standardize the reported frequency to number of times in the last 30 days. If the frequency was reported as "never", the value was re-coded as zero.

Analytic Notes

Although this data was collected as part of the household questionnaire, if it is merged with the exam data, exam sample weights should be used for the analyses.

 

Please refer to the NNYFS Analytic Guidelines for further details on the use of sample weights and other analytic issues.

References

N/A.

Codebook and Frequencies