A national survey is conducted to assess the association between hypertension and stroke in persons over 75 years of age. Development of stroke was monitored over a 5 year follow-up period. The data are summarized below and the numbers are in millions. Developed Stroke Did not Develop Stroke Hypertension 24 74 No Hypertension 8 52?
a) Compute the incidence of stroke in persons over 75 years of age
b) Compute the relative risk of stroke comparing hypertensive to non-hypertensive persons
c) Compute the odds ratio of stroke comparing hypertensive to non-hypertensive persons