Validity, reliability and factor analysis of Persian version of schizophrenia quality of life scale

Nasrin Masaeli, .; Victoria Omranifard, .; Mohammad Reza Maracy, .; Gholam Reza Kheirabadi, .; Anahita Khedri, .

Validity, reliability and factor analysis of Persian version of schizophrenia quality of life scale

Authors

. Nasrin Masaeli

. Victoria Omranifard

. Mohammad Reza Maracy ¹

. Gholam Reza Kheirabadi ²

. Anahita Khedri

¹ Department of Biostatics, School of Health

² Behavioral Sciences Research Center, Isfahan University of Medical Sciences, Isfahan, Iran

Abstract

Context: Exact measurement of quality of life (QOL) in schizophrenia patients for evaluation
of the patient’s deterioration and also to assess the efficacy of therapeutic Interventions has
become a daily task, which requires accurate assessment tools. Aims: This study was aimed to
assess the psychometric properties of a Persian version of schizophrenia QOL scale (SQLS) as
a common transcultural instrument. Settings and Design: One hundred and fifty schizophrenia
patients who referred to Psychiatric Clinic in Noor Hospital (Isfahan, Iran) have been selected
using simple sampling method. Subjects and Methods: Aside with SQLS, short form‑36
general health (SF‑36) and World Health Organization QOL‑brief‑26 (WHOQOL‑BREF‑26).
Questionnaires were completed by the cases for determination of correlation coefficients.
Statistical Analysis Used: The data were analyzed using descriptive statistics, factor
analysis, Cronbach’s coefficient alpha, Pearson correlation coefficient by Statistical
Package for Social Sciences software, version 18 (SPSS‑18). Results: Total reliability of
the questionnaire was reported by using Cronbach’s coefficient alpha 0.84, reliability of
individual relationships subscales was 0.91, signs 0/87, symptoms 0/72 and motivation/
energy 0/61. Correlation coefficients of SF‑36 with a total scale of SQLS and correlation
coefficient of WHOQOL‑BREF‑26 with a total scale of SQLS were acceptable. Exploratory
factor analysis using varimax rotation identified four principle components (interpersonal
relationship, symptoms, signs, motivation, and energy), which will determine QOL at 52.7%
variance. Conclusions: Persian version of the SQLS can be used as a simple, reliable and
valid tool in Iranian population.

Keywords

Quality of life

Persian version

psychometric

schizophrenia

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