Endgames

Statistical question

Likelihood ratios

BMJ 2009; 338 doi: 10.1136/bmj.b2077 (Published 27 May 2009)
Cite this as: BMJ 2009;338:b2077

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  1. John Fletcher, clinical epidemiologist
  1. 1BMJ, London WC1H 9JR
  1. jfletcher{at}bmj.com

    In a study of general practice records in the UK, the symptom of dysphagia was found to have a positive likelihood ratio of 300 for oesophageal cancer, which itself had an incidence of 1 case in every 10 000 persons per year. Which of the following statements, if any, are true?

    • a) Among people with dysphagia, the ratio of those with cancer to those without …

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