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[Correspondence] Body-mass index and all-cause mortality

The meta-analysis of body-mass index (BMI) and mortality from the Global BMI Mortality Collaboration in The Lancet,1 emphasised the selection of very large studies, few of which use measured weight and height data. Because of this selection bias, 94% of deaths in their primary analyses of North American data came from 20 studies with self-reported weight and height. The Global BMI Mortality Collaboration found that for North America the hazard ratio (HR) for overweight BMI was 1·00 using measured weight and height, and 1·14 using self-reported weight and height.