Study should have been randomised

BMJ 1996; 313 doi: https://doi.org/10.1136/bmj.313.7059.755b (Published 21 September 1996) Cite this as: BMJ 1996;313:755
  1. Bernadette A Loughnan, Consultant anaesthetist,
  2. Harry Gordon, Consultant obstetrician and gynaecologist,
  3. Andrew O Frank, Consultant physician in rehabilitation and rheumatology
  1. Northwick Park Hospital, Harrow, Middlesex HA1 3UJ

    EDITOR,—We wish to make several comments about Robin Russell and colleagues' study looking at possible factors in long term backache after childbirth.1 Firstly, the study was not randomised with respect to controls, and the authors justify this by stating that randomisation would have been unethical. We would argue that a randomised controlled trial is the only way to validate the use of …

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