ArticleBMC musculoskeletal disorders2025
A shortened 10-item Spine Functional Index: clinimetric properties indicate a reliable, responsive and practical measure.
Article in BMC musculoskeletal disorders, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundTo assess the 10-item Spine Functional Index (SFI-10) clinimetric properties in a general musculoskeletal disorder (MSD) spine population. Ascertain the psychometric characteristics' consistency with the developmental study findings for structural and criterion validity, internal consistency, and floor/ceiling effect; establish the longitudinal characteristics for test-retest reliability, responsiveness, construct validity, and error scores; and clarify practical characteristics of readability, missing responses, and time/errors for completion/scoring related to administrative burden.
methodsA longitudinal study of deidentified spine MSD patients (n = 1317, 53.4% female, age = 18-91yrs, av = 49.5 ± 16.4yrs; neck = 36.5%, mid-back = 8.4%, low back = 56.0%, multi-site = 0.3%) who completed the SFI-10, the Patient Specific Functional Scale (PSFS), and Numerical Rating Scales for Global-function (G-NRS) and Pain (P-NRS). Structural validity used factor analysis, exploratory (EFA) and confirmatory (CFA), plus Rasch analysis. Criterion validity used Spearman's correlation coefficient (r) between the SFI-10 and criteria (PSFS, G-NRS and P-PRS) scores, and construct validity (n = 91, known-groups independent t-test). Internal consistency used Cronbach's alpha (α) and floor/ceiling effects were determined. Subgroups determined reliability (n = 104, intraclass correlation coefficient, ICC
resultsThe SFI-10's structural validity was unequivocally one-dimensional from EFA and verified by CFA with acceptable fit-indices (chi-square/df = 2.88, CFI = 0.981, TLI = 0.975, RMSEA = 0.061), and supported by Rasch analysis (PSR = 0.79, Infit = 0.678-1.216, Outfit = 0.604-1.279, Item-difficulties = -1,215-2.488). Criterion validity varied from high (G-NRS, r = 0.60) and moderate (PSFS, r = 0.43) to low-inverse (P-NRS, r = -0.24). Internal consistency was strong (α = 0.84) and no floor/ceiling effects were present. Reliability was excellent (ICC
conclusionsThe SFI-10 demonstrates sound measurement properties in a general physiotherapy outpatient MSD spine population for both psychometric and practical characteristics. Further investigation in culturally diverse settings that include both inpatients and community settings with whole-spine and regional-spine criteria is required.
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