1. In 2006, at the Health and Retirement Study identified a sample of 10,868 wom
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Question
1. In 2006, at the Health and Retirement Study identified a sample of 10,868 women, and examined them for diabetes. 2,006 of the women had diabetes. The project then followed the subjects who did not have diabetes for two years. 1,087 either died from other causes, or were lost to follow up (assume they died or were lost to follow-up exactly half-way through the two-year follow-up period). 273 women developed diabetes during the study period.
e. Considering the number of women that lasted only 1 year, and the number of women that lasted both years, calculate the total number of person-years for the study.
f. What was the incidence density of diabetes during the two-year study period (per 1000 person-months)?
Explanation / Answer
e. The total number of person-years for the study is 19,730 years.
f. 25.55 is the incidence density of biabetes during the two-year study period.
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