Validity and Reliability of the Premorbid Adjustment Scale in a Sample of Turkish Schizophrenic Patients

The Premorbid Adjustment Scale (PAS) has gained a reputation as the foremost retrospective assessment tool, although little is known about its reliability and validity. The aim of the study is to examine the psychometric properties of the PAS in a sample of Turkish schizophrenic patients.

The research was carried out with 80 patients with schizophrenia and 50 healthy people. The sociodemographic form and PAS were applied to both groups. In addition, the Disability Assessment Schedule (DAS)-II and Positive and Negative Syndrome Scale were applied to the patients. In the statistical evaluation, the internal consistency coefficient, explanatory factor analysis, and correlation with other scales were calculated.

The average age of the schizophrenia group was 39.15 ± 12.19 and 45.9 ± 12.18 for control. The average years of education (9.91 ± 3.79 for the schizophrenia group and 11.08 ± 4.73 for control) and gender distribution (55% of the schizophrenia group and 46% of the control group were female) were similar. The internal consistency of the PAS was 0.93, and the subscales were between 0.75 and 0.92. Two-factor solution was observed, explaining 72.97% of the total variance. In regard to convergent validity, the correlation coefficients between the total scores of DAS II and PAS and PAS late and early adolescence and childhood were 0.45, 0.53, 0.48, 0.37, and 0.22, respectively (P < .001). The correlation coefficients between the total score of PAS and the total score of DAS 1, DAS 3, DAS 4, DAS 5, and DAS 6 were calculated as 0.46, 0.43, 0.39, 0.48, and 0.44 (P < .001), respectively. The PAS significantly differentiated the schizophrenia group from the control group.

The PAS is reliable and valid for Turkish.