In Reply.—I am indebted to Tilley and colleagues.
I was unaware of the difference between incidence and prevalence. The former means "rate of occurrence... "; the latter means "the percentage of a population that is affected.... "1 Perhaps prevalence is a better word from an epidemiologic standpoint.
Tilley and colleagues make many criticisms about the manner in which the data were obtained. I had not read the article that appeared more than 30 years ago in the American Heart Journal. The relative number of blacks vs whites was essentially the same in the autopsy series, the CT scans that were reviewed, the hospital population, and the population of North Carolina. It was recognized that a type I error was possible, and this should have been addressed.
I presented this report as provocative information. I believe I accomplished this purpose. I sincerely hope that Tilley and colleagues will undertake a significant
JOHNSON G. Aneurysms of the Abdominal Aorta-Reply. Arch Surg. 1987;122(1):119. doi:10.1001/archsurg.1987.01400130124021