Alan L. Silver, MD, MPH; David N. Rose, MD
To the Editor: We applaud Sox and colleagues' analysis (1) of the role of exercise testing in coronary artery disease. We are concerned, however, with the interpretation of the results, specifically, how one assesses the average change in the life expectancy for an entire cohort as opposed to a change for a single individual.
The authors state, for example, that for 60-year-old men with at least one risk factor, the average increase in life expectancy for the cohort is 17 days. However, given that the prevalence of disease is presumed to be 0.15, the average change in life expectancy for
Silver AL, Rose DN. Life Expectancies: Population or Person?. Ann Intern Med. ;111:257–258. doi: 10.7326/0003-4819-111-3-257
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Published: Ann Intern Med. 1989;111(3):257-258.
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