Note on 2007-2008 Sampling Methodology

In 2007-2008 a new sampling methodology was implemented. We oversampled all Hispanics, not just Mexican Americans (Table 1). In addition, for each of the race/ethnicity domains, the 12-15 and 16-19 year age domains were combined and the 40-59 year age minority domains were split into 10 year age domains 40-49 and 50-59 (Table 2). This has led to an increase in the number of participants aged 40+ and a decrease in 12-19 year olds from previous cycles.  Lastly, we no longer oversampled pregnant women. Based on these changes some variables have been modified from previous release cycles.

Table1. Unweighted sample size and percent by race/ethnicity from NHANES 2005-06 and 2007-08 for examined participants

Race / Ethnicity	Number (2005-06)	Percent (2005-06)	Number (2007-08)	Percent (2007-08)
Hispanic-Mexican American	2,739	27.5	2,064	21.1
Hispanic-Other Hispanic	330	3.3	1,147	11.7
Non-Hispanic Black	2,615	26.3	2,141	21.9
Non-Hispanic White	3,778	38.0	3,969	40.7
Other	488	4.9	441	4.5
Total	9,950	100	9,762	100

Table2. Unweighted sample size and percents by age groups from NHANES 2005-06 and 2007-08 for examined participants

Age group (years)	Number (2005-06)	Percent (2005-06)	Number (2007-08)	Percent (2007-08)
0-5	1,864	18.7	1,630	16.7
6-11	1,106	11.1	1,215	12.4
12-19	2,207	22.2	1,210	12.4
20-39	1,839	18.5	1,844	18.9
40-59	1,446	14.5	1,818	18.6
60+	1,488	15.0	2,045	20.9
Total	9,950	100	9,762	100