Objective: To analyze the psychometric properties of the World Health Organization's Quality of Life Instrument--Spirituality, Religion and Personal Beliefs module (WHOQOL-SRPB).
Methods: The WHOQOL-SRPB, the Brief Spiritual/Religious Coping Scale (Brief-SRCOPE Scale), the WHOQOL-BREF and the Beck Depression Inventory (BDI) were consecutively applied in a convenience sample of 404 patients and workers of a university hospital and workers of a university, in the city of Porto Alegre, Southern Brazil, between 2006 and 2009. The sample was stratified by sex, age, health status and religion/belief. The retest of the two first instruments was conducted with 54 participants. Exploratory factorial analyses of the WHOQOL-SRPB with the method of main components were performed, without limiting the number of factors, and requiring eight factors concomitantly with the WHOQOL-BREF items.
Results: The Brazilian Portuguese version of the WHOQOL-SRPB (General SRPB-Domain) showed construct validity, with a discriminatory validity between believers and non-believers (t = 7.40; p = 0.0001); concurrent criterion-related validity, distinguishing depressed individuals from non-depressed ones (t = 5.03; p = 0.0001); convergent validity with the WHOQOL-BREF (physical r = 0.18; psychological r = 0.46; social r = 0.35; environmental r = 0.29; global r = 0.23; p = 0.0001) and with the SRPB-Domain of the WHOQOL-100 (r = 0.78; p = 0.0001); and convergent/discriminatory validity with the brief SRCOPE Scale (with positive SRCOPE r = 0.64; p = 0.0001/negative SRCOPE r = -0.03; p = 0.554). Excellent test-retest reliability (t = 0.74; p = 0.463) and internal consistency (α = 0.96; intrafactorial correlation 0.87 > r > 0.60; p = 0.0001) were observed. The exploratory factorial analyses performed corroborated the eight-factor structure of the WHOQOL-SRPB multicenter study.
Conclusions: The Brazilian Portuguese version of the WHOQOL-SRPB showed good psychometric qualities and use valid and reliable in Brazil. It is suggested that new studies be conducted with specific populations, such as different religions, cultural groups and/or diseases.
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