The development of a self-reported scale for measuring functionality in patients with schizophrenia—Self-reported version of the graphic Personal and Social Performance (SRG-PSP) scale

Abstract

BackgroundThe Personal and Social Performance (PSP) scale is used for the assessment of patient function by mental health professionals. This study aimed to evaluate the internal reliability and validity of a self-reported graphic version of the PSP (SRG-PSP) scale and its correlations with psychiatric symptoms, daily life ability and quality of life. MethodsThe SRG-PSP scale was developed following the four PSP domains: socially useful activities, personal and social relationships, self-care, and disturbing and aggressive behavior. In total, 108 patients with schizophrenia were enrolled. All participants completed the SRG-PSP, the Activities of Daily Living Rating Scale II (ADLRS-II), and the World Health Organization Quality of Life-BREF (WHOQOL). They were also assessed using the PSP and the Positive and Negative Syndrome Scale (PANSS). Spearman's ρ was used to examine the correlations between SRG-PSP scores and other variables. ResultsThe results of the SRG-PSP were significantly correlated to those of their corresponding criteria on the PSP. The global score of the SRG-PSP and the scores of three domains, socially useful activities, personal and social relationships, and self-care, were positively correlated with most sub items of the ADLRS-II and WHOQOL, and were negatively correlated with the PANSS scores. The disturbing and aggressive behavior domain of the SRG-PSP was negatively correlated with most sub items of the ADLRS-II and WHOQOL (ρ=−0.19 to −0.36, all p<0.05) and positively correlated with the PANSS (ρ=0.24–0.30, all p<0.05), with the exception of negative symptoms (ρ=0.09, p=0.40). ConclusionThe SRG-PSP is a valid self-reported scale for the assessment of functionality in patients with schizophrenia.