The 2004–2005 Wave 2 sample of the National Epidemiologic Survey on Alcohol and Related Conditions (NESARC) was used in the present study. The NESARC is based on a nationally representative sample of the US non-institutionalized population 18 years of age or older who reside in households and group quarters (e.g., college dormitories, group homes, boarding homes) throughout the 50 states and the District of Columbia. A detailed description of the NESARC Wave 1 and 2 methodologies is reported elsewhere (Grant et al., 2003; Grant and Kaplan, 2007; Read et al., 2004). African Americans, Hispanics, and adults aged 18–24 were over-sampled, with data adjusted for over-sampling and household- and person-level non-response. All procedures, including informed consent, received full ethical review and approval from the US Census Bureau and US Office of Management and Budget.
