Letters

Authors' reply

BMJ 1996; 313 doi: https://doi.org/10.1136/bmj.313.7055.495 (Published 24 August 1996) Cite this as: BMJ 1996;313:495
  1. Charles R Gillis, Director,
  2. David J Hole, Principal epidemiologist
  1. West of Scotland Cancer Surveillance Unit, Ruchill Hospital, Glasgow G20 9NB

    EDITOR,—We wish to respond to several points raised in the previously published letters1 and the above letters about our paper.2 None of Ian Campbell's points1 change our results or their interpretation. We considered selective bias by analysing our data on the basis of hospital catchment areas. Specialists and non-specialists worked in the same hospital serving the same catchment areas. There was a 4.6% advantage in five year survival for those catchment areas where the specialists saw 44% of …

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