Abstract
Eighty-eight subjects aged 14 or more, randomly selected from a general population sample living in the district N.4 of South-Verona, completed the 30-item General Health Questionnaire (GHQ) and were interviewed by two psychiatrists using the Clinical Interview Schedule (CIS). The CIS inter-rater reliability was tested by product-moment correlation, weighted kappa and three way analysis of variance. The tests gave good results. The GHQ-30 displayed at the best cut-off point of 5/6 a sensitivity of 73.9% and a specificity of 83.1%. A comparison between GHQ-30, GHQ-12 and C-GHQ (Goodchild and Duncan-Jones method of scoring), obtained in the usual way as well as using ROC-analysis, showed that the three questionnaires performed very similarly.
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