Baseline differences in alcoholism problem severity were compared between alcoholics who did and did not volunteer to participate in a treatment effectiveness study. A positive relationship was found between self-reports of alcohol-related problems and the degree of research participation. Group differences were also revealed in the rate of treatment completion. Possible explanations and solutions for this volunteer bias are discussed.
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Title
Subject Selection Bias in Alcoholics Volunteering for a Treatment Study
Publication Details
Alcoholism, clinical and experimental research, Vol.14(5), pp.736-738