TY - JOUR A1 - Peter, C. A1 - Schulenberg, S. E. A1 - Buchanan, E. M. A1 - Prodinger, Birgit A1 - Geyh, S. T1 - Rasch analysis of measurement instruments capturing psychological personal factors in persons with spinal cord injury JF - Journal of Rehabilitation Medicine N2 - Objective: To evaluate the metric properties of distinct measures of psychological personal factors comprising feelings, beliefs, motives, and patterns of experience and behaviour assessed in the Swiss Spinal Cord Injury Cohort Study (SwiSCI), using Rasch methodology. Methods: SwiSCI Pathway 2 is a community-based, nationwide, cross-sectional survey for persons with spinal cord injury (SCI) (nā€‰=ā€‰511). The Rasch partial credit model was used for each subscale of the Positive Affect Negative Affect Scale (PANAS), Appraisal of Life Events Scale (ALE), Purpose in Life test ā€“ Short Form (PIL-SF), and the Big Five Inventory-K (BFI-K). Results: The measures were unidimensional, with the exception of the positive affect items of the PANAS, where pairwise t-tests resulted in 10% significant cases, indicating multidimensionality. The BFI-K subscale agreeableness revealed low reliability (0.53). Other reliability estimates ranged between 0.61 and 0.89. Ceiling and floor effects were found for most measures. SCI-related differential item functioning (DIF) was rarely found. Language DIF was identified for several items of the BFI-K, PANAS and the ALE, but not for the PIL-SF. Conclusion: A majority of the measures satisfy the assumptions of the Rasch model, including unidimensionality. Invariance across language versions still represents a major challenge. KW - psychological factors KW - personality KW - affect KW - spinal cord injury KW - validity KW - reliability KW - psychometrics Y1 - 2016 UR - http://dx.doi.org/10.2340/16501977-2028 VL - 48 IS - 2 SP - 175 EP - 188 ER -