The 2001–2002 National Epidemiological Survey of Alcohol and Related Conditions (NESARC) is a study of a representative sample of the USA conducted by the National Institute on Alcohol Abuse and Alcoholism (NIAAA; see Grant et al., 2003 for more details). The NESARC target population was the civilian non-institutionalized population 18 years and older residing in households and group quarters. Face-to-face interviews were conducted with 43,093 respondents (response rate = 81%). Blacks, Hispanics, and young adults (ages 18–24) were oversampled with data adjusted for oversampling as well as household- and person-level non-response. The weighted data were then adjusted based on 2000 census data to represent the U.S. civilian population (see Grant et al., 2003, for more details).