Rasch validation of the Activities-specific Balance Confidence Scale and its short versions in patients with Parkinson's disease

Franco Franchignoni, Andrea Giordano, Gianpaolo Ronconi, Alessia Rabini, Giorgio Ferriero

Research output: Contribution to journalArticlepeer-review

Abstract

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 unidimensionality; (ii) the selection of its items is satisfactory, although there is room for some minor refinement; (iii) the 0-10 rating scale should be simplified, and a 5-level response format seems able to improve the measurement qualities of the scale; (iv) the 3 short versions showed some psychometric limitations in comparison with the ABC.

Original languageEnglish
Pages (from-to)532-539
Number of pages8
JournalJournal of Rehabilitation Medicine
Volume46
Issue number6
DOIs
Publication statusPublished - 2014

Keywords

  • Balance confidence
  • Fear of falling
  • Parkinson's disease
  • Psychometrics

ASJC Scopus subject areas

  • Rehabilitation
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Medicine(all)

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