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Letters Commuting and incident disease

Authors’ reply to Colquhoun and Buchinsky

BMJ 2017; 357 doi: (Published 19 May 2017) Cite this as: BMJ 2017;357:j2447
  1. Jason M R Gill, reader1,
  2. Carlos A Celis-Morales, research associate1,
  3. Naveed Sattar, professor1,
  4. Jill P Pell, professor2
  1. 1BHF Glasgow Cardiovascular Research Centre, Institute of Cardiovascular and Medical Sciences, University of Glasgow, G12 8TA, UK
  2. 2Institute of Health and Wellbeing, University of Glasgow, Glasgow, UK
  1. jason.gill{at}

Colquhoun makes an important comment about reverse causality in our study of active commuting.12 We excluded people with reported prevalent disease at baseline but cannot exclude the possibility that including those with subclinical or undiagnosed disease at baseline could have influenced the findings. In the manuscript we originally submitted we simply considered two groups of commuters—active and non-active. We tried to minimise the potential contribution of reverse causality by undertaking a sensitivity …

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