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Epidemiology Homework #2
Question 1:
The total population of Toronto on October 6, 2015 is 183,000. The number of active TB cases
according to the Public Health Office in Toronto on December 6, 2015 was 264. The number of
new active TB cases occurring between June 6, 2015 – December 6, 2015 was 26.
A. What is the incidence rate during that 6 month period?
B. What is the prevalence rate of TB as of December 6?
Question 2:
A study of hypertension was undertaken and focused on 1000 men between the ages of 40-45
years. At a baseline examination (beginning of the study), 50 of the men were identified as
already having hypertension. The remaining 950 were followed for 5 years, during which 100
developed hypertension [15 in year one, 21 in year two, 25 in year three, 19 in year four, and
20 in year five].
A. What is the cumulative incidence of hypertension at the end of year three? (1 point)
B. What is the prevalence rate of hypertension at the end of year four? (1 point)
C. What is the period prevalence of hypertension in the timeframe of this study? (1
point)
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