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  Vol. 6 No. 5, September 1997 TABLE OF CONTENTS
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The Utility of the 'Brief MAST' and the 'CAGE' in Identifying Alcohol Problems

Results From National High-Risk and Community Samples

Raymond R. Crowe, MD; John R. Kramer, PhD; Victor Hesselbrock, PhD; George Manos, MS; Kathleen K. Bucholz, PhD

Arch Fam Med. 1997;6(5):477-483.


Abstract

Background
The CAGE and the Brief MAST questionnaires are widely used to screen for alcohol problems. We tested the performance of these instruments in 2 population-based groups: a high-risk sample composed of ralatives of alcoholic subjects and a community sample consisting of families not selected for alcoholism (ie, alcohol dependence disorder).

Methods
A total of 3435 relatives of alcoholics and 795 control subjects were interviewed with the Semi-Structured Assessment for the Genetics of Alcoholism (SSAGA) semistructured interview in a multicenter collaborative study on the genetics of alcoholism. The performance of "CAGE" and "Brief MAST" equivalent items in the SSAGA was characterized by their positive predictive value, sensitivity, specificity, and percentage of the sample who screened positive.

Results
Both questionnaires performed well in the high-risk sample, where the base rate of alcoholism was 35%. However, in the community sample, where the 16% rate of alcoholism was comparable to that of the US population (14%), an acceptable positive predictive value could be achieved only through a substantial reduction in sensitivity. Results were similar when men were compared with women and when lifetime alcoholics were compared with current alcoholics.

Conclusion
The "Brief MAST" and "CAGE" can be effective instruments to screen for significant alcohol problems in both community and high-risk patients; as expected, their positive predictive value increases with the base rate of alcoholism in the population being screened.



Author Affiliations

From the Departments of Psychiatry, University of Iowa College of Medicine, Iowa City (Drs Crowe and Kramer and Mr Manos), the University of Connecticut Health Center, Farmington (Dr Hesselbrock), and Washington University, St Louis, Mo (Dr Bucholz).



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