Likelihood ratios

doi:10.1136/bmj.b2077

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John Fletcher, clinical epidemiologist

¹BMJ, London WC1H 9JR

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?