The NESARC Wave 1 is a national survey of the U.S. civilian population, based on a group quarters sampling frame as described in detail elsewhere (Grant et al., 2001b). Face-to-face interviews were conducted with 43,093 respondents in 2001–2002. The overall response rate was 81%. Blacks, Hispanics and young adults ages 18 to 24 were oversampled in the NESARC. Weights were provided in NESARC to account for oversampling, nonresponse, and the selection of one person per household. The weighted data were representative of the civilian noninstitutional population of the United States based on the 2000 Decennial Census. All eligible respondents from Wave 1 who had not died, were not institutionalized, had not left the country, or had not entered the military were reinterviewed approximately 3 years later (n=39,959). The reinterview completion rate was 86.9%, yielding a total of 34,653 adults. Sample weights for Wave 2 respondents were calculated to ensure that the weighted Wave 2 sample represented the original baseline population of 2001–2002. The present analysis draws on the total sample of 34,653 respondents. Details about the NESARC sampling design and methodology are described elsewhere (Grant et al., 2004b, 2009).
