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Статистическая викторина Британского медицинского журнала
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04.08.2009, 13:52
Наталья П.
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Likelihood ratios
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 is 300 to 1
b) Cancer is 300 times more likely in patients with dysphagia than in the general population
c) More than 95% of people with dysphagia seeing their general practitioner will have cancer
d) More than 95% of people with dysphagia seeing their general practitioner will not have cancer
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