NESARC is a survey of non-institutionalized US adults residing in homes or group quarters. NESARC data were collected at two time points: Wave 1 (2001–2002) with 43,093 participants and Wave 2 (2004–2005) with 34,653 of the original participants (cumulative Wave 2 response rate, 70.2%). Young, Black and Hispanic individuals were oversampled. Data were weighted to reflect the demographic characteristics of the US population based on the 2000 census (Grant et al., 2004; Grant et al., 2005). The research protocol, including written informed consent, received approval from the US Census Bureau and the US Office of Management and Budget. Further study details are described elsewhere (Grant et al., 2004; Grant et al., 2005; Ruan et al., 2008).
