Letters Smoking prevalence in England

Authors’ reply to Roscoe

BMJ 2014; 348 doi: https://doi.org/10.1136/bmj.g1946 (Published 06 March 2014) Cite this as: BMJ 2014;348:g1946
  1. Jamie Brown, senior research fellow1,
  2. Martin Jarvis, professor1,
  3. Robert West, professor of health psychology1
  1. 1University College London, London WC1E 7HB, UK
  1. jamie.brown{at}ucl.ac.uk

To answer Roscoe, the key issue is the quality of the data being collected rather than the numbers entailed.1 2 Although the Quality and Outcomes Framework database comprises a much larger sample, smoking status is not assessed using a standardised question and the exact timing …

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