The NESARC target population at baseline (Wave 1: 2001–2002) was the civilian non-institutionalized population 18 years and older residing in households and group quarters (Grant et al., 2004, 2009). The final sample included 43,093 respondents drawn from individual households and group quarters. Blacks, Hispanics, and adults 18–24 were oversampled, with data adjusted for oversampling, household, and person-level non-response. The survey response rate was 81%. Data were adjusted using the 2000 Decennial Census, to be representative of the US civilian population for a variety of sociodemographic variables. Experienced lay interviewers were trained and conducted interviews under close supervision (Grant et al., 2004, 2009). All procedures, including informed consent, received full human subjects review and approval from the US Census Bureau and US Office of Management and Budget.
