Authors' reply

BMJ 1995; 310 doi: https://doi.org/10.1136/bmj.310.6986.1068b (Published 22 April 1995) Cite this as: BMJ 1995;310:1068

This article has a correction. Please see:

  1. David C E F Lloyd,
  2. Conrad M Harris,
  3. David W Clucas
  1. Applied statistical officer Director Senior computer officer Prescribing Research Unit, Leeds University Research School of Medicine, Leeds LS2 NZ

    EDITOR,—Nicky Britten and colleagues say that we did not validate our index at practice level in the way that we did at family health services authority level. This would have required the postcode of every patient; not only is this impractical but we have already established, in a paper submitted for publication, that attributing census data to practices can give severely misleading results. R S James' comment, although possibly true, is not relevant until Jarman figures based on the 1991 …

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