Subjects were participants in NESARC, a nationally representative face-to-face survey of 43,093 respondents aged 18 years and older (response rate, 81%), conducted by the National Institute on Alcohol Abuse and Alcoholism (NIAAA) in 2001–2002. The NESARC assessed the civilian non- institutionalized population residing in the United States. African-Americans and Hispanics were oversampled, as were young adults. The research protocol, including informed consent procedures, received full ethical review and approval from the US Census Bureau and the Office of Management and Budget.
