Journal:Journal of Spinal Cord Medicine
Year, Volume, Issue, Page(s):14, 1, 38, 386-396
Article describes the development and psychometric properties of the Spinal Cord Injury-Quality of Life (SCI-QOL) item bank and computer adaptive test (CAT) to assess the effects of stigma on health-related quality of life in individuals with spinal cord injury (SCI). The project included grounded-theory based qualitative item development methods, large-scale item calibration field testing, confirmatory factor analysis (CFA), and item response theory (IRT)-based psychometric analyses. A sample of 611 individuals with traumatic SCI, recruited from 5 SCI Model Systems and 1 Veterans Affairs medical center, completed 30 items assessing SCI-related stigma. After 7 items were iteratively removed, CFA confirmed a unidimensional pool of items. Graded response model IRT analyses were used to estimate slopes and thresholds for the final 23 items. The SCI-QOL Stigma item bank is unique not only in the assessment of SCI-related stigma but also in the inclusion of individuals with SCI in all phases of its development. Use of confirmatory factor analytic and IRT methods provide flexibility and precision of measurement. The item bank may be administered as a CAT or as a 10-item fixed-length short form and can be used for research and clinical applications.