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Analysis did not account for cluster randomisation

BMJ 2000; 321 doi: (Published 09 December 2000) Cite this as: BMJ 2000;321:1473
  1. Graeme Maclennan, research fellow (,
  2. Craig Ramsay, research fellow,
  3. Jeremy M Grimshaw, programme director,
  4. Marion K Campbell, programme director
  1. Health Services Research Unit, University of Aberdeen, Aberdeen AB25 2ZD

    EDITOR—We congratulate Chapman et al for their paper on prevention of dog bites in children.1 The study was a cluster randomised trial; schools were allocated to intervention or control groups, and data were collected at the level of the individual schoolchild. The analysis did, however, not account for cluster randomisation. The assumption of …

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