Letters Physical activity in children

Authors’ reply to Symonds

BMJ 2012; 345 doi: https://doi.org/10.1136/bmj.e7029 (Published 24 October 2012) Cite this as: BMJ 2012;345:e7029
  1. Brad Metcalf, research fellow and statistician1,
  2. William Henley, professor of medical statistics2,
  3. Terence Wilkin, professor of endocrinology and metabolism1
  1. 1Department of Endocrinology and Metabolism, Peninsula College of Medicine and Dentistry, Plymouth University Campus, Plymouth, UK
  2. 2Institute of Health Services Research, Peninsula College of Medicine and Dentistry, University of Exeter Campus, Exeter, UK
  1. brad.metcalf{at}nhs.net

Symonds misses (or denies) the value of systematic review and meta-analysis.1 It is not appropriate to cherry pick individual studies that seem to work best because this introduces the risk of selection error. Rather, trials should be grouped and compared according to type, setting, design, etc, as they were in our …

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