Question

Epidemiology Question: The diabetes follow-up study included 218 diabetic women and 3,823 nondiabetic women.
By the end of the study, 72 of the diabetic women and 511 of the nondiabetic women had
died. The diabetic women were observed for a total of 1,862 person years; the nondiabetic
women were observed for a total of 36,653 person years. Calculate the incidence rates of
death for the diabetic and non-diabetic women.

Answer 1

## Q ) Epidemiology Question: The diabetes follow-up study included 218 diabetic women and 3,823 non diabetic women. By the end of the study, 72 of the diabetic women and 511 of the non diabetic women had
died. The diabetic women were observed for a total of 1,862 person years; the non diabetic
women were observed for a total of 36,653 person years. Calculate the incidence rates of
death for the diabetic and non-diabetic women.

Answer :  

## For Diabetic women , numerator = 72 and denominator = 1862  

Person time rate = 72 / 1862  

= 0.0386 deaths per person year

= 38.6 deaths per 1000 person years .

## For Non diabetic women , numerator = 511 and denominator = 36653

Person time rate = 511 / 36653 = 0.0139 deaths per person year

= 13.9 deaths per 1000 person years .

## we can find out rate ratio :

rate ration = for diabetic / for non diabetic  

= 38.6 / 13.9 = 2.8