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Published on: June 30, 2014
Measurement properties of the Trunk Impairment Scale-modified Norwegian version among people with mild to moderate
Stine Susanne Haakonsen Dahl1, Tonje Braaten1,2, Ellen Christin Arntzen1
1Faculty of Nursing and Health Sciences, Nord University, Bodø, Norway.
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.
