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Alcohol-related blackouts in a medical practice.

One hundred thirty-five individuals seeking help for an alcohol or drug problem from a family physician completed a self-report questionnaire. Eighty-six percent of respondents reported having experienced alcohol-related blackouts. Blackouts were found to be most strongly related to severity of alcohol problems. They were not clearly early-stage nor middle-stage indicators of alcohol problems and were not associated with a variety of neuropsychological indicators.