A town has a population of 500,000. In a five year period there are 1250 cases of bladder cancer
diagnosed at the only hospital. During the same period the occupational health department
diagnosed a further 500 cases. What is the annual incidence per million of bladder cancer in this
population?
a. 2100
b. 1750
c. 1400
d. 700
e. 350
answer: D
1250 + 500 = 1750 cases in 5 years for a population of 500,000
1750 x 2 = 3500 cases in 5 years per million
3500/ 5 years = 700 cases per year