Abstract
Purpose The Trunk Impairment Scale–modified Norwegian version (TIS-modNV) measures trunk control for clinical and research purposes. This study examined the validity and reliability of the TIS-modNV in people with multiple sclerosis (pwMS). Materials and methods Sixty-eight pwMS (mild to moderate) participated. The TIS-modNV and the Mini-Balance Evaluation Systems Test (Mini-BESTest) scores were compared for construct validity using Spearman’s rho (rs ). TIS-modNV performance was videotaped and rated by four physiotherapists on two occasions. The inter- and intrarater reliability was analyzed via intraclass correlation coefficients (ICC), standard errors of measurement (SEM), Bland–Altman plots, and kappa statistics (k). Results Validity was demonstrated (rs = 0.55–0.61). Interrater reliability for the total score was moderate to good (ICC(A,1) =0.67; ICC(C,1) = 0.78), and the SEM was 2 points (12.8%). Interrater reliability varied across the rater pairs (ICC(A,1) = 0.54-0.81) as displayed in the Bland–Altman plots. Item-level interrater agreement varied from poor to good (k = 0.10–0.79). Intrarater reliability of the total scores was moderate to good (ICC(A,1) = 0.67–0.82). Conclusion This study supports the construct validity and overall reliability of the TIS-modNV in pwMS with mild to moderate disability. However, variations in rater reliability need to be addressed.
Published Version
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