National Health and Nutrition Examination Survey

2007-2008 Data Documentation, Codebook, and Frequencies

Respiratory Health (RDQ_E)

Data File: RDQ_E.xpt

First Published: January 2010

Last Revised: NA

Component Description

The Respiratory Disease Section (prefix RDQ) provides interview data for respiratory symptoms that may be related to chronic bronchitis or asthma. The symptoms profiled include cough, phlegm production, and wheezing. Data is also collected on trigger factors for these symptoms, for medical treatment and for related functional impairments.

Topics:

History Cough and Phlegm Production (RDQ031-RDQ060)

12 Month Period Prevalence of:

Wheezing (RDQ070)
Frequency of Wheezing Episodes (RDQ080)
Sleep Disturbance Due to Wheezing (RDQ090)
Wheezing With Exercise (RDQ100)
Number of Doctor, Hospital or Emergency Room Visits for Wheezing (RDQ120)
Prescription Medication Taken For Wheezing (RDQ134)
Limitation of Usual Activities Due to Wheezing (RDQ135)
Number of Days of Work/School Missed Due to Wheezing (RDQ137)
Dry Nocturnal Cough (RDQ140)
Hay Fever (AGQ030)

Eligible Sample

Questions regarding a history of cough and phlegm production were administered only to Survey Participants ages 40 years and above, except for RDQ140 (History of Dry Nocturnal Cough) which was administered to Survey Participants 1+ years.

Questions regarding a history of wheezing were administered to Survey Participants ages 1+ years except for RDQ137 which was administered to Survey Participants ages 6 to 69 years (school-age and working-age persons). The question series RDQ120 through RDQ137 was administered to all participants with a history of wheezing.

Interview Setting and Mode of Administration

These questions were asked before the physical examination, in the home, using the Computer-Assisted Personal Interviewing-CAPI (interviewer administered) system.

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.

Data Processing and Editing

Data editing (for example “top coding” of continuous variables) is documented in the RDQ Section Codebook.

Analytic Notes

These data were collected as part of the NHANES Household Questionnaire Interview and NHANES Household Interview weights should be used if only questionnaire data is analyzed. However, if RDQ_E questionnaire data is merged with the MEC examination data, then NHANES MEC examination sample weights should be used for the analyses.

Current NHANES questionnaire data collection relating to respiratory symptoms is based on prior NHANES surveys as well as validated survey instruments. It is recommended that data analysts be familiar with current practice and issues in the epidemiologic investigation of respiratory disease. (Pierce, et al.; Halbert, et al; Celli, et al; Pauwels, et al)

Related NHANES 2007-2008 Questionnaire Datasets:

Medical Conditions (MCQ) contains questionnaire data on a history of a previous medical provider diagnosis of respiratory disease (asthma, chronic bronchitis, emphysema), age at onset of disease, and family history of asthma.
Physical Functioning (PFQ) contains data on functional physical limitations as well information on the type of health problems (including respiratory disease) causing the difficulty.
Cardiovascular Disease (CDQ) contains data for dyspnea (shortness of breath) on exertion for adults ages 40+.
Smoking (SMQ) contains data on past history of smoking.
Occupation (OCQ) includes data on current and longest occupation, as well as identification of a Survey Participants exposure to second-hand smoke in their current job (OCQ290G/Q).
Prescription Medications (RXQ) contains data on all prescription medications currently taken.

Please note that the hay fever question AGQ030 was also asked in the NHANES 2005-06 survey cycle as a part of the 2005-6 Allergy Questionnaire.

Please refer to the NHANES Analytic Guidelines and the on-line NHANES Tutorial for further details on the use of sample weights and other analytic issues. Both of these are available on the NHANES website.

References

Celli BR, Halbert RJ, Isonaka S, Schau B. Population impact of different definitions of airway obstruction. Eur Respir J. 2005; 22:268-73.
Halbert RJ, Isonaka S, George D, Iqbal A. Interpreting COPD prevalence estimates: what is the true burden of disease? Chest. 2005; 123:1684-92.
Pauwels RA, Buist AS, Calverley PM, Jenkins CR, Hurd SS; GOLD Scientific Committee. Global strategy for the diagnosis, management, and prevention of chronic obstructive pulmonary disease. NHLBI/WHO Global Initiative for Chronic Obstructive Lung Disease (GOLD) Workshop summary. Am J Respir Crit Care Med. 2001; 163:1256-76.
Pierce N, Beasley R, Burgess C, Crane J. Asthma Epidemiology: Principles and Methods. 1998. New York: Oxford University Press.

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 1 YEARS - 150 YEARS

RDQ005A - CHECK ITEM

Variable Name:: RDQ005A
English Instructions:: IF AGE < 40 YEARS, GO TO RDQ070. OTHERWISE, CONTINUE.
Target:: Both males and females 1 YEARS - 150 YEARS

RDQ031 - Coughing most days - over 3 mo period

Variable Name:: RDQ031
SAS Label:: Coughing most days - over 3 mo period
English Text:: {Do you/Does SP} usually cough on most days for 3 consecutive months or more during the year?
Target:: Both males and females 40 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
1	Yes	473	473
2	No	3548	4021	RDQ050
7	Refused	0	4021	RDQ050
9	Don't know	3	4024	RDQ050
.	Missing	5642	9666

RDD040 - # years had cough problem

Variable Name:: RDD040
SAS Label:: # years had cough problem
English Text:: For how many years {have you/has SP} had this cough?
English Instructions:: ENTER NUMBER OF YEARS. IF LESS THAN 1 YEAR, ENTER 1; IF 70 OR MORE YEARS ENTER 70
Target:: Both males and females 40 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
1 to 67	Range of Values	453	453
70	70 or more	4	457
77777	Refused	0	457
99999	Don't know	16	473
.	Missing	9193	9666

RDQ050 - Bring up phlegm most days - 3 mo period

Variable Name:: RDQ050
SAS Label:: Bring up phlegm most days - 3 mo period
English Text:: {Do you/Does SP} bring up phlegm on most days for 3 consecutive months or more during the year?
Target:: Both males and females 40 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
1	Yes	401	401
2	No	3622	4023	RDQ070
7	Refused	0	4023	RDQ070
9	Don't know	1	4024	RDQ070
.	Missing	5642	9666

RDD060 - # years bringing up phlegm problem

Variable Name:: RDD060
SAS Label:: # years bringing up phlegm problem
English Text:: For how many years, {have you/has SP} had trouble with phlegm?
English Instructions:: ENTER NUMBER OF YEARS. IF LESS THAN 1 YEAR, ENTER 1; IF 70 OR MORE YEARS ENTER 70
Target:: Both males and females 40 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
1 to 61	Range of Values	381	381
70	70 or more	4	385
77777	Refused	0	385
99999	Don't know	16	401
.	Missing	9265	9666

RDQ070 - Wheezing or whistling in chest - past yr

Variable Name:: RDQ070
SAS Label:: Wheezing or whistling in chest - past yr
English Text:: In the past 12 months {have you/has SP} had wheezing or whistling in {your/his/her} chest?
Target:: Both males and females 1 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
1	Yes	1331	1331
2	No	8330	9661	RDQ140
7	Refused	0	9661	RDQ140
9	Don't know	5	9666	RDQ140
.	Missing	0	9666

RDQ080 - # wheezing/whistling attacks past year

Variable Name:: RDQ080
SAS Label:: # wheezing/whistling attacks past year
English Text:: [In the past 12 months], how many attacks of wheezing or whistling {have you/has SP} had?
English Instructions:: IF 12 OR MORE EPISODES, ENTER 12; ENTER NUMBER OF EPISODES.
Target:: Both males and females 1 YEARS - 150 YEARS
Hard Edits:: 1 to 12

Code or Value	Value Description	Count	Cumulative
1 to 12	Range of Values	1300	1300
7777	Refused	0	1300
9999	Don't know	31	1331
.	Missing	8335	9666

RDQ090 - Wheezing disturb sleep in past year

Variable Name:: RDQ090
SAS Label:: Wheezing disturb sleep in past year
English Text:: [In the past 12 months], how often, on average, has {your/SP's} sleep been disturbed because of wheezing? Would you say this happens . . .
Target:: Both males and females 1 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	Never,	632	632
1	1 or more nights per week, or	389	1021
2	Less than 1 night per week?	304	1325
7	Refused	0	1325
9	Don't know	6	1331
.	Missing	8335	9666

RDQ100 - Chest sound wheezy during exercise

Variable Name:: RDQ100
SAS Label:: Chest sound wheezy during exercise
English Text:: [In the past 12 months], has {your/SP's} chest sounded wheezy during or after exercise or physical activity?
Target:: Both males and females 1 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	630	630
2	No	688	1318
7	Refused	0	1318
9	Don't know	13	1331
.	Missing	8335	9666

RDD120 - # medical visits for wheezing attacks

Variable Name:: RDD120
SAS Label:: # medical visits for wheezing attacks
English Text:: [In the past 12 months], how many times {have you/has SP} gone to the doctor's office or the hospital emergency room for one or more of these attacks of wheezing or whistling?
English Instructions:: ENTER NUMBER. IF NEVER, ENTER 0;IF 20 OR MORE MONTHS ENTER 20.
Target:: Both males and females 1 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0 to 14	Range of Values	1326	1326
20	20 or more	2	1328
7777	Refused	0	1328
9999	Don't know	3	1331
.	Missing	8335	9666

RDQ134 - Doctor prescribe wheezing medication

Variable Name:: RDQ134
SAS Label:: Doctor prescribe wheezing medication
English Text:: (In the past 12 months), (have you/has SP) taken medication, prescribed by a doctor, for wheezing or whistling?
Target:: Both males and females 1 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	786	786
2	No	544	1330
7	Refused	0	1330
9	Don't know	1	1331
.	Missing	8335	9666

RDQ135 - Amount wheezing limits usual activity

Variable Name:: RDQ135
SAS Label:: Amount wheezing limits usual activity
English Text:: During the past 12 months, how much did {you/SP} limit {your/his/her} usual activities due to wheezing or whistling? Would you sayï¿½
Target:: Both males and females 1 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
1	Not at all,	739	739
2	A little,	324	1063
3	A fair amount,	126	1189
4	A moderate amount, or	60	1249
5	A lot?	82	1331
7	Refused	0	1331
9	Don't know	0	1331
.	Missing	8335	9666

RDQ136 - CHECK ITEM

Variable Name:: RDQ136
English Instructions:: BOX 4. CHECK ITEM RDQ136: IF AGE BETWEEN 6 AND 69 YEARS THEN CONTINUE. OTHERWISE, GO TO RDQ140.
Target:: Both males and females 1 YEARS - 150 YEARS

RDQ137 - # Work/school days lost due to wheezing

Variable Name:: RDQ137
SAS Label:: # Work/school days lost due to wheezing
English Text:: During the past 12 months, how many days of work or school did {you/SP} miss due to wheezing or whistling?
Target:: Both males and females 6 YEARS - 69 YEARS

Code or Value	Value Description	Count	Cumulative
0	None	758	758
1	1 to 7	186	944
2	8 to 30	38	982
3	31 plus	16	998
7	Refused	2	1000
9	Don't know	7	1007
.	Missing	8659	9666

RDQ140 - Had dry cough at night in past year

Variable Name:: RDQ140
SAS Label:: Had dry cough at night in past year
English Text:: [In the past 12 months], {have you/has SP} had a dry cough at night not counting a cough associated with a cold or chest infection lasting 14 days or more?
Target:: Both males and females 1 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	524	524
2	No	9139	9663
7	Refused	0	9663
9	Don't know	3	9666
.	Missing	0	9666

AGQ030 - Episode of hay fever in past 12 months?

Variable Name:: AGQ030
SAS Label:: Episode of hay fever in past 12 months?
English Text:: During the past 12 months, {have you/has SP} had an episode of hay fever?
Target:: Both males and females 1 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	1139	1139
2	No	8485	9624
7	Refused	0	9624
9	Don't know	42	9666
.	Missing	0	9666

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