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30-item General Health Questionnaire in general hospitals: selecting items using a stepwise hierarchical procedure
J Wancata1, R Alexandrowicz, N Benda
1Department of Psychiatry, University of Vienna, Austria. johannes.wancata@akh-wien.ac.at
Abstract:
An attempt was made to improve the validity of the 30-item General Health Questionnaire by excluding items. This exclusion was performed by using correlations of sum-scores with an external case criterion. This hierarchical approach based on subsets of items (stepwise hierarchical variable selection) resulted in a 9-item questionnaire whose discriminating performance was significantly better than that of the original version.
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