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To establish an appropriate scoring system using Rasch scores for the strategic, tactical, and operational levels of the Neck Pain Driving Index (NPDI) and to refine the NPDI by testing the unidimensionality of each driving performance level using Rasch analysis.Cross-sectional.Tertiary institution.Individuals with chronic whiplash-associated disorders (WAD) (N=123).Not applicable.The NPDI, which...
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