Intended for healthcare professionals

Endgames Statistical question

Outcome measures in case-control studies

BMJ 2009; 338 doi: (Published 22 April 2009) Cite this as: BMJ 2009;338:b1575
  1. John Fletcher, clinical epidemiologist
  1. 1BMJ, London WC1H 9JR
  1. jfletcher{at}

    A case-control study was carried out using general practice records to investigate whether a low fibre diet is a risk factor for irritable bowel disease. One hundred new cases of irritable bowel disease and 200 randomly selected controls were found through a search of practice records, and the patients were then approached to be interviewed. Which of the following, if any, could be estimated …

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