A national survey is conducted to assess the association between hypertension and stroke in persons over 55 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
|
12
|
37
|
|
No Hypertension
|
4
|
26
|
| |
|
|
|
a) Compute the incidence of stroke in persons over 55 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