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 in Table 3.14. TABLE 3.14 Incidence of Stroke in Men and Women Number of Strokes Men (n=125) Women (n-200) 21 Number of Stroke-Free Person-Years 478 97 a. What is the annual incidence rate of stroke in men? b. What is the annual incidence rate of stroke in women? c. What is the annual incidence rate of stroke (men and women combined)?

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