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Atle Klovning, MD
University of Bergen Bergen, Norway

JAMA. 1997;278(10):819.

	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.

—At the Second Nordic Workshop on Evidence-Based Health Care in Oslo, Norway, in June 1997, our group worked on the JAMA article on appendicitis.¹ I tried to calculate the positive LR by using the numbers provided in Table 3 in the formula² (sensitivity/[1-specificity]) and calculated, for example, a positive LR of 1.59 vs 3.76 in the article for rigidity and a LR positive of 1.72 vs 7.31 to 8.46 in the article for right lower quadrant pain. The numbers appear to be wrong.

The authors alternatively could have presented the findings as a summary of receiver operating characteristic curves, which might have been easier to interpret. . . . [Full Text PDF of this Article]

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