Likelihood ratiosBMJ 2009; 338 doi: https://doi.org/10.1136/bmj.b2077 (Published 27 May 2009) Cite this as: BMJ 2009;338:b2077
- John Fletcher, clinical epidemiologist
- 1BMJ, London WC1H 9JR
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 …