Study should have had more patients or longer time scale

BMJ 1996; 313 doi: https://doi.org/10.1136/bmj.313.7063.1006a (Published 19 October 1996) Cite this as: BMJ 1996;313:1006
  1. Jonathan Mant, Clinical lecturer in public health medicine,
  2. Nicholas R Hicks, Consultant public health physician,
  3. John Fletcher, Honorary research fellow
  1. Department of Public Health and Primary Care, University of Oxford, Radcliffe Infirmary, Oxford OX2 6HE
  2. Oxfordshire Health Authority, Oxford OX3 9DZ
  3. Unit of Health Care Epidemiology, Oxford Institute of Health Sciences, Oxford OX2 6HE

    EDITOR,—We welcome Richard J Davenport and colleagues' reminder of the importance of correcting outcome data for case mix.1 Given the size of their study, however, they should not be surprised or disappointed that they were unable to show a beneficial impact of their stroke unit on mortality.

    The 12 month mortality before the introduction of their stroke unit in Edinburgh was 39%.1 A meta-analysis of the effect of stroke …

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