The Kappa Statistic in Reliability Studies: Use, Interpretation, and Sample Size Requirements

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ID: 289745
2005
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Abstract
This article examines and illustrates the use and interpretation of the kappa statistic in musculoskeletal research.The reliability of clinicians' ratings is an important consideration in areas such as diagnosis and the interpretation of examination findings. Often, these ratings lie on a nominal or an ordinal scale. For such data, the kappa coefficient is an appropriate measure of reliability. Kappa is defined, in both weighted and unweighted forms, and its use is illustrated with examples from musculoskeletal research. Factors that can influence the magnitude of kappa (prevalence, bias, and non-independent ratings) are discussed, and ways of evaluating the magnitude of an obtained kappa are considered. The issue of statistical testing of kappa is considered, including the use of confidence intervals, and appropriate sample sizes for reliability studies using kappa are tabulated.The article concludes with recommendations for the use and interpretation of kappa.
Reference Key
openalex_W2170021941 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Julius Sim, Chris Wright
Journal Physical Therapy
Year 2005
DOI
10.1093/ptj/85.3.257
URL
https://academic.oup.com/ptj/article-pdf/85/3/257/31670498/ptj0257.pdf
Keywords Keywords not found

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