Table 1.

National Demographic Characteristic Distribution of Participants, Disposition Groups, and Response Rates for National Young Adult Health Survey, Wave I (2011) and Wave II (2013)

Demographic Characteristic	Wave I			Wave II			2010 Census %
Demographic Characteristic	No.	Unweighted %	Weighted %	No.	Unweighted %	Weighted %	2010 Census %
Sex
Male	1,372	47.8	48.0	1,509	48.8	48.3	50.6
Female	1,499	52.2	52.0	1,586	51.2	51.8	49.4
Age group, years
18–21	785	27.3	28.8	831	26.8	28.5	25.0
22–24	589	20.5	20.5	603	19.5	19.6	17.7
25–29	873	30.4	30.0	903	29.2	28.4	29.4
30–34	624	21.7	20.7	758	24.5	23.4	27.8
Race/ethnicity^a
White, non-Latino	1,691	58.9	57.7	1,741	56.3	55.0	57.5
Black, non-Latino	334	11.6	12.7	417	13.5	14.7	13.4
Latino	391	13.6	13.7	480	15.5	15.8	20.3
Asian, non-Latino	198	6.9	6.9	280	9.1	9.1	5.5
Other, non-Latino	218	7.6	7.7	109	3.5	3.2	3.3
Mean absolute deviation		3.0	3.0		1.9	2.5
Dispositions
Complete	2,874	1.6		3,095	1.5
Eligible and contacted but not interviewed	2,683	1.5		3,259	1.6
Eligibility undetermined	95,040	53.6		117,765	57.2
Not eligible	76,779	43.3		81,613	39.7
Total	177,376			205,732
Response rates^b
Response rate 4^c		24.0			20.8
Cooperation rate 2^d		51.7			48.1
Cooperation rate 4^e		64.2			61.7
Refusal rate 2^f		13.4			12.9

^a The total sums to less than 100 because of nonresponse to 1 or more of the race or ethnicity questions.

^b Response rates were based on categories from the American Association for Public Opinion Standard Definitions: Final Dispositions of Case Codes and Outcome Rates for Surveys (12).

^c Response rate 4 was calculated as the number of completed interviews plus the number of partially completed interviews divided by the total number of known eligible subjects plus an estimate of the number of eligible subjects among those whose eligibility was undetermined.

^d Cooperation rate 2 was calculated as the number of completed interviews plus the number of partially completed interviews divided by the total number of contacts known to be eligible.

^e Cooperation rate 4 was calculated the same way as cooperation rate 2, but it excludes persons who were eligible but unable to participate because of poor health, communication problems, and other barriers.

^f Refusal rate 2 was calculated as the number of people who refused to participate plus breakoffs divided by the number of both interviewed and noninterviewed contacts known to be eligible plus an estimate of the number of eligible subjects among those whose eligibility was undetermined.