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Reliability and validity of the Personal and Social Performance scale in patients with schizophrenia
Beenish Nafees1, Patricia van Hanswijck de Jonge, Donald Stull
1Oxford Outcomes Ltd, Oxford, UK. beenish.nafees@oxfordoutcomes.com
Objective:
The construct validity and test-retest reliability of the Personal and Social Performance (PSP) scale were used to assess social functioning in a cohort of ethnically diverse UK patients with schizophrenia.
Methods:
A total of 73 patients with schizophrenia took part in the study. At baseline, the PSP, two symptomatology scales and two other functioning scales were administered. A subset of the sample (N=40) took part in a retest where the Clinical Global Impression-Severity (CGI-S) and PSP scales were administered 8-10 days later.
Results:
PSP significantly correlated with all other measures, Positive and Negative Syndrome Scale (PANSS), Global Assessment of Functioning (GAF) and Quality of Life Scale (QLS) at baseline (p<0.02) and with CGI-S at follow-up (p<0.01). In addition, the PSP scale was moderately sensitive to the severity of illness. Test-retest reliability for the PSP score was 0.45 and the scale was able to discriminate between known groups (mild and severe patients).
Conclusion:
The PSP was easy to administer in this predominantly inpatient cohort and was moderately correlated with all other functioning measures tested. Due to patient homogeneity, the test-retest reliability statistic of the PSP was lower than that observed in other studies.
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