Letters Obesity and choice of transport

Authors’ reply to McGregor and Foley

BMJ 2014; 349 doi: https://doi.org/10.1136/bmj.g5921 (Published 30 September 2014) Cite this as: BMJ 2014;349:g5921
  1. Ellen Flint, research fellow1,
  2. Steven Cummins, professor of population health1,
  3. Amanda Sacker, professor of lifecourse studies2
  1. 1Department of Social and Environmental Health Research, London School of Hygiene and Tropical Medicine, London WC1H 9SH, UK
  2. 2ESRC International Centre for Lifecourse Studies in Society and Health, Research Department of Epidemiology and Public Health, University College London, London WC1E 6BT, UK
  1. ellen.flint{at}lshtm.ac.uk

McGregor and Foley draw attention to the design of our study on mode of commuting and body composition.1 2 3 We concur with their comments that cross sectional data do not allow causal inference, but previous studies using quasi-experimental study designs have provided indirect evidence that active and public transport uptake is associated with improvements in body mass index.4 Further research …

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