RT Journal Article SR Electronic T1 The Spirituality Index of Well-Being: A New Instrument for Health-Related Quality-of-Life Research JF The Annals of Family Medicine JO Ann Fam Med FD American Academy of Family Physicians SP 499 OP 503 DO 10.1370/afm.89 VO 2 IS 5 A1 Daaleman, Timothy P. A1 Frey, Bruce B. YR 2004 UL http://www.annfammed.org/content/2/5/499.abstract AB PURPOSE Despite considerable interest in examining spirituality in health-related quality-of-life studies, there is a paucity of instruments that measure this construct. The objective of this study was to test a valid and reliable measure of spirituality that would be useful in patient populations. METHODS We conducted a multisite, cross-sectional survey using systematic sampling of adult outpatients at primary care clinic sites in the Kansas City metropolitan area (N = 523). We determined the instrument reliability (Cronbach’s α, test-retest) and validity (confirmatory factor analysis, convergent and discriminant validation) of the Spirituality Index of Well-Being (SIWB). RESULTS The SIWB contains 12 items: 6 from a self-efficacy domain and 6 from a life scheme domain. Confirmatory factor analysis found the following fit indices: χ2 (54, n = 508) = 508.35, P <.001; Comparative Fit Index = .98; Tucker-Lewis Index = .97; root mean square error of approximation = .13. The index had the following reliability results: for the self-efficacy subscale, α = .86 and test-retest r = 0.77; for the life scheme subscale, α = .89 and test-retest r = 0.86; and for the total scale α = .91 and test-retest r = 0.79, showing very good reliability. The SIWB had significant and expected correlations with other quality-of-life instruments that measure well-being or spirituality: Zung Depression Scale (r = 0–.42, P <.001), General Well-Being Scale (r = 0.64, P <.001), and Spiritual Well-Being Scale (SWB) (r = 0.62, P <.001). There was a modest correlation between the religious well-being subscale of the SWB and the SIWB (r = 0.35, P <.001). CONCLUSIONS The Spirituality Index of Well-Being is a valid and reliable instrument that can be used in health-related quality-of-life studies.