The kappa statistic in reliability studies: use, interpretation, and sample size requirements.

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 Ther

journal_title

Physical therapy

authors

Sim J,Wright CC

subject

Has Abstract

pub_date

2005-03-01 00:00:00

pages

257-68

issue

3

eissn

0031-9023

issn

1538-6724

journal_volume

85

pub_type

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