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Thomas A. Bell, MD, MPH; Stephen F. O'Brien, MD; James A. Farrow, MD
University of Washington Seattle

JAMA. 1990;264(4):453.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

To the Editor.—

Shafer et al¹ reported the usefulness of urine dipsticks for testing urine samples from males for microscopic pus, the presence of which correlates well with the presence of both Chlamydia trachomatis and Neisseria gonorrhoeae. These results are similar to our own published in 1988² but not mentioned by Shafer et al. We found that the 95% confidence interval for the sensitivity of the presence of leukocyte esterase was 78% to 100%; for the specificity it was 73% to 91%; and for the positive predictive value it was 34% to 72%. The results from Shafer et al for a comparable population—68%, 91%, and 49%, respectively—are remarkably close to our estimates. Ninety-five percent confidence intervals seem to be empirically relevant and should be taken seriously in interpretation of results. . . . [Full Text PDF of this Article]

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