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Subject selection bias in alcoholics volunteering for a treatment study
D B Strohmetz1, A I Alterman, D Walter
1Temple University, Philadelphia, Pennsylvania.
Alcoholism, Clinical and Experimental Research
|October 1, 1990
Abstract:
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.