Arguments prove nothing unless verified. A commentary on Kaufman's "Epidemiologic analysis of racial/ethnic disparities: some fundamental issues and a cautionary example".

Jay Kaufman has attempted to provide a scholarly assessment of pitfalls in attempting to assign the cause of disease outcomes to apparent racial differences (Kaufman, 2008). Apart from a number of factual errors in his arguments, he has continued to follow the same path as other authors, whom he appears to deride, in misinterpreting the conclusions of our 2001 paper, ‘‘Lesser response to angiotensin-converting-enzyme inhibitor therapy in black as compared with white patients with left ventricular dysfunction’’ published in the New England Journal of Medicine (Exner, Dries, Domanski, Cohn, 2001). Despite Kaufman’s assertions, the matched-cohort design we used in our retrospective analysis of