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
- Ellen Flint, research fellow1,
- Steven Cummins, professor of population health1,
- Amanda Sacker, professor of lifecourse studies2
- 1Department of Social and Environmental Health Research, London School of Hygiene and Tropical Medicine, London WC1H 9SH, UK
- 2ESRC International Centre for Lifecourse Studies in Society and Health, Research Department of Epidemiology and Public Health, University College London, London WC1E 6BT, UK
- 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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