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The Work-ability Support Scale: Evaluation of Scoring Accuracy and Rater Reliability.
- Source :
- Journal of Occupational Rehabilitation; Sep2014, Vol. 24 Issue 3, p511-524, 14p, 8 Charts
- Publication Year :
- 2014
-
Abstract
- Purpose The Work-ability Support Scale (WSS) is a new tool designed to assess vocational ability and support needs following onset of acquired disability, to assist decision-making in vocational rehabilitation. In this article, we report an iterative process of development through evaluation of inter- and intra-rater reliability and scoring accuracy, using vignettes. The impact of different methodological approaches to analysis of reliability is highlighted. Methods Following preliminary evaluation using case-histories, six occupational therapists scored vignettes, first individually and then together in two teams. Scoring was repeated blind after 1 month. Scoring accuracy was tested against agreed 'reference standard' vignette scores using intraclass correlation coefficients (ICCs) for total scores and linear-weighted kappas (kw) for individual items. Item-by-item inter- and intra-rater reliability was evaluated for both individual and team scores, using two different statistical methods. Results ICCs for scoring accuracy ranged from 0.95 (95 % CI 0.78-0.98) to 0.96 (0.89-0.99) for Part A, and from 0.78 (95 % CI 0.67-0.85) to 0.84 (0.69-0.92) for Part B. Item by item analysis of scoring accuracy, inter- and intra-rater reliability all showed 'substantial' to 'almost perfect' agreement (kw ≥ 0.60) for all Part-A and 8/12 Part-B items, although multi-rater kappa (Fleiss) produced more conservative results (mK = 0.34-0.79). Team rating produced marginal improvements for Part-A but not Part-B. Four problematic contextual items were identified, leading to adjustment of the scoring manual. Conclusion This vignette-based study demonstrates generally acceptable levels of scoring accuracy and reliability for the WSS. Further testing in real-life situations is now warranted. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10530487
- Volume :
- 24
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Journal of Occupational Rehabilitation
- Publication Type :
- Academic Journal
- Accession number :
- 97287695
- Full Text :
- https://doi.org/10.1007/s10926-013-9486-1