Abstract

This study analyzed the diagnostic and differential diagnostic function of the PAI clinical scales. To investigate the diagnostic function of the clinical scales, scale and subscale scores of normal, depression, bipolar, schizophrenia, alcoholic, and drug offender were compared. In each group the percentage of clinical scales and subscales exceeding a T score of 65(cutoff score) were calculated. DEP and ANX scores in depression, MAN score in bipolar, PAR score in schizophrenia, ALC score in alcoholic, and DRG score in drug offender were significantly high, respectively. The percentage of these scales exceeding the cutoff scores were the highest in the corresponding group. In the clinical scales, five diagnostic discriminant factors were derived. The PAI clinical scales found out to be composed in single diagnostic discriminant factor. The hit rate of normal was 91.0%, depression was 54.3%, bipolar was 57.6%, schizophrenia was 50.6%, alcoholic was 92.9%, and drug offender was 71.6% and the overall classification rate was 73.8%. These results suggest that the clinical scales are useful to diagnose and discriminate individual disorders that are to be measure.