Rasch validation of the Activities-specific Balance Confidence Scale and its short versions in patients with Parkinson's disease.
DOI:
https://doi.org/10.2340/16501977-1808Keywords:
balance confidence, fear of falling, Parkinson�s disease, psychometricsAbstract
OBJECTIVE: To analyse in patients with Parkinson's disease the psychometric performance of the Activities-specific Balance Confidence scale (ABC) and its 3 short versions, using both a classical test theory approach and Rasch analysis. METHODS: A sample of 217 patients with Parkinson's disease was assessed by ABC and the 3 short versions: Berg Balance Scale, Fear of Falling Measure, and the Unified Parkinson's Disease Rating Scale. RESULTS: Cronbach's α was 0.95 in ABC, and ranged from 0.88 to 0.90 in its short versions. At Rasch analysis the 11 original rating categories were collapsed to 5 levels. In ABC 15 out of 16 items fitted the Rasch model. The ABC showed high correlation only with Fear of Falling Measure (r = 0.85), and excellent correlation with its short versions (r > 0.93). The 3 short versions showed a limited range of item difficulty estimates, low reliability levels, floor effect, a mismatch between mean item difficulty and mean ability of the patients. CONCLUSION: In patients with Parkinson's disease: (i) the ABC has an adequate unidimensionalityDownloads
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