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The Journal of Bone and Joint Surgery 78:1445-6 (1996)
© 1996 The Journal of Bone and Joint Surgery, Inc.

Correspondence

Correspondence

Margaret G. E. Peterson, Ph.D., Jeffrey N. Katz, M.D., M.S., Charlotte B. Phillips, R.N., M.P.H., Robert Poss, M.D., John J. Harrast, M.S., Anne H. Fossel, Matthew H. Liang, M.D., M.P.H. and Clement B. Sledge, M.D.

TO THE EDITOR:

The article "The Validity and Reliability of a Total Hip Arthroplasty Outcome Evaluation Questionnaire" (77-A: 1528–1534, Oct. 1995), by Katz et al., is interesting but may perpetuate a bad statistical practice. The authors desired to measure "reliability" with the use of two points in time. I assume that they meant reproducibility of results or stability of results under stable conditions. They used Spearman correlation to measure test-retest reliability. Of itself, this statistical test does not indicate reproducibility. In fact, it is possible to get perfect correlation with r = 1 and to have no agreement between the answers for any subject. If the r value is high and the mean and standard deviation are in agreement at the two time-periods, there may, in fact, be good concordance. However, we were not told the mean or median values. The Cohen kappa, which measures reproducibility for ordinal data or . . . [Full Text of this Article]


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