Intended for healthcare professionals

Letters Covid-19 worldwide

Covid-19 worldwide: we need precise data by age group and sex urgently

BMJ 2020; 369 doi: (Published 03 April 2020) Cite this as: BMJ 2020;369:m1366
  1. Raj Bhopal, emeritus professor of public health
  1. Usher Institute, University of Edinburgh, Edinburgh EH8 9AG, UK
  1. raj.bhopal{at}

Accurate and interpretable data are essential in guiding our approach to the covid-19 pandemic. Basic epidemiological principles are currently being flouted.1 Mostly, as in your article,2 case numbers are being reported. This number needs to be converted to a proportion, using the population size as the denominator. Otherwise, how can we tell which countries are …

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