The Diagnostic Interview Schedule was used in 1993-1995 to collect information on the use of alcohol and other substances from 1,086 Navajo Indians living on or near their reservation in the southwestern United States. Bivariate and multivariate analyses are used to show that age of first alcohol use has declined over the past 50 years and is a significant risk factor for both alcohol dependence and polysubstance use. Limitations are noted.
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