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doctorportal Learning is on the move as we will be launching a new website very shortly. If you would like to sign up to dp Learning now to register for CPD learning or to use our CPD tracker, please email support@doctorportal.com.au so we can assist you. If you are already signed up to doctorportal Learning, your login will work in the new site so you can continue to enrol for learning, complete an online module, or access your CPD tracker report.

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All other doctorportal services, such as Find A Doctor, are no longer available.

[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.