Letters

Author's reply

BMJ 1994; 308 doi: https://doi.org/10.1136/bmj.308.6937.1164b (Published 30 April 1994) Cite this as: BMJ 1994;308:1164
  1. Caroline H C Acton
  1. Director, Brisbane bicycle study, University of Queensland, Royal Children's Hospital, Herston, Queensland 4029, Australia.

    EDITOR,--I and my colleagues generally agree with Patricia Priest's criticism and comments. Our discussion particularly aimed to emphasise the potential inadequacies of the case-control design, and we were careful to suggest that results from our study cannot stand alone and that a cause and effect relation might be suggested only by large population based cohort studies. By high compliance with helmet wearing we meant levels similar to those quoted in our results, with about half the population wearing helmets, to ensure adequate …

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