Data for this study came from Waves 1 and 2 of NESARC (N=34 653). The Wave 1 (2001–2002) NESARC target population was the civilian noninstitutionalized population residing in households and group quarters, aged ≥18 years. Blacks, Hispanics, and ages 18–24 years were oversampled, with data adjusted for oversampling, household- and person-level non-response. The weighted data were then adjusted to represent the US civilian population based on the 2000 Census (Grant et al. 2004). For Wave 2 (2004–2005), all possible eligible respondents were re-interviewed (Grant et al. 2009; Hatzenbuehler et al. 2008). Excluding respondents ineligible for Wave 2 because they were deceased, deported, mentally or physically impaired or on active duty in the armed forces throughout the follow-up period, the Wave 2 response rate was 86.7%, with a cumulative response rate over the two surveys (i.e. the product of Waves 1 and 2 response rates) of 70.2%. All respondents were informed in writing about the nature of the survey and uses of the data, its voluntary aspect, and that federal laws protected confidentiality of the survey information. The research protocol, including
