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To the Editor: In the study by Dr Wang and colleagues,¹ the Figure lists the underlying data for the Kaplan-Meier survival curves for the study. Presumably the total number of persons at risk in year zero should equal the total number of persons who survived to year 16 plus those who developed AF and those died in the follow-up period. This calculation works for the men. However, for the women, 2898 started the study while 2899 finished, died without developing AF, or developed AF (2093 + 572 + 234). Although this is not likely to affect the overall results, I am curious about this apparent discrepancy.

Daniel Parish, JD
daniel.parish@jefferson.edu
Jefferson Medical College
Philadelphia, Pa

1. Wang TJ, Parise H, Levy D, et al. Obesity and the risk of new-onset atrial fibrillation. JAMA. 2004;292:2471-2477. FREE FULL TEXT

Letters Section Editor: Robert M. Golub, MD, Senior Editor.

JAMA. 2005;293:1974.

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