Question

A diabetes study included 218 diabetic women and 3,823 non-diabetic women. By the end of the study, 83 of the diabetic women and 422 of the non-diabetic women had died. The diabetic women were observed for a total of 1,526 person- years; the non-diabetic women were observed for a total of 31,806 person-years. Calculate the incidence rates (aka incidence density) of death for the diabetic and non-diabetic women (Show work).

Answer 1

Incidence Density = New deaths $\div$ total person-years

Incidence density for diabetic = 83 $\div$ 1526

                                               = 0.0543 deaths per person-year

For 1000 person-years = 54.3 deaths

Incidence density for non-diabetic = 422 $\div$ 31806

                                                     = 0.0132

For 1000 person-years = 13.2 deaths