V. Which of the following are incidence measures and which are prevalence measures? a) AIDS mortality in US in 2015 b) Frequency of liver nodules at autopsy at Brigham Women Hospital c) Congenital heart defects at birth in Boston in 2015 d) Occurrence of retinopathy among patients who have had diabetes for 10 years e) Number of students in DRA-809 who had a headache at this moment f) Number of students in DRA-809 who had a headache at any time in the past week g) Number of students in DRA-809 who wear corrective lenses h) Number of patients with post-operative complications at the BWH.

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