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Phill is doing respiratory exams in the run up to his MOSLER finals. Because he is committed to the cause, he has arranged to see 100 patients, 90 of whom have obvious respiratory signs and disease. After a morning's hard work, Phill reports that he has found 23 patients with respiratory pathology. The examiner tells him that these diagnoses were correct in 19. Feeling rather chuffed, Phill asks the examiner if all the other people were healthy. The examiner replies that, of the 77 he decided were fine, 71 had respiratory disease. Phill feels disheartened but wants to work out some statistics about his respiratory examination effectiveness. What is the sensetivity of Phill's exam?

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