As described in more detail elsewhere (Grant, Harford et al., 1994; Grant, Peterson et al., 1994; Grant et al., 2004), the 1991–1992 NLAES is a NIAAA-sponsored nationally representative survey of the United States population. A sample of 42,862 respondents, age 18 and older, residing in the non-institutionalized population of the contiguous United States, were administered face-to-face interviews. Response rates were good (overall survey response rate of 90%; Grant, Peterson et al., 1994). As with NESARC, Blacks and young adults (ages 18–29) were oversampled. The NLAES data were weighted for complex sampling and then adjusted based on 1990 census data to represent the U.S. civilian population (see Grant, Harford et al., 1994; Grant, Peterson et al., 1994; Grant et al., 2004, for more details).
