A prospective cohort study is run to estimate the incidence of stroke in persons 55 years of age and older. all participants are free of stroke at study start. Each participant is followed for a maximum of 5 years. The data are summarized below
|
Number of strokes |
# of stroke-free person-years |
| Men(n=125) |
9 |
478 |
| Women (n=200) |
21 |
974 |
A) what is the annual incidence rate of stroke in men? Incidence rate= _________ per 1,000 person-years/
B) What is the annual incidence rate of stroke in women? Incidence rate=__________ per 1,000 person-years.
C) What is the annual incidence rate of stroke for men and women combined? Incidence rate=______ per 1,000 person-years