a prospective cohort study is run to estimate the incidence of stroke in persons 55 years and older. all participants are free of stroke at study start. each participant is followed for maximum 5 years.
# strokes # stroke free person-year
men (n=125) 9 478
women (n=200) 21 974
a. what is annual incidence rate stroke in men? incidence rate=______per 1000 person year.
b. what is annual incidence rate of stroke women? incidence rate=______per 1000 per year.
c. what is combined annual incidence rate? (men & women) incidence rate=________per 1000 person year.