Relative risks should not have been adjusted for body mass index

doi:10.1136/bmj.313.7067.1259

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Arne Astrup

Director Research Department of Human Nutrition, Royal Veterinary and Agricultural University, 1958 Frederiksberg, Denmark

EDITOR,—In their prospective study of 43 757 health professionals in the United States, Alberto Ascherio and colleagues found that the multivariate relative risk of myocardial infarction was increased to 1.22 (95% confidence interval 0.96 to 1.56) and that of fatal coronary heart disease was increased to 2.21 (1.38 to 3.54) for …