Abstract:
PURPOSE:This article examines and illustrates the use and interpretation of the kappa statistic in musculoskeletal research. SUMMARY OF KEY POINTS: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. CONCLUSIONS:The article concludes with recommendations for the use and interpretation of kappa.
journal_name
Phys Therjournal_title
Physical therapyauthors
Sim J,Wright CCsubject
Has Abstractpub_date
2005-03-01 00:00:00pages
257-68issue
3eissn
0031-9023issn
1538-6724journal_volume
85pub_type
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