1716 Framingham women Exercise 179 m women Exercise 179 cons

17.16 Framingham women. Exercise 17.9 m women. Exercise 17.9 considered 6-year coronary disease risk consid in Framingham men. Comparable data for Framingham women revealed 30 coronary incidents in 689 women with high serum cholesterol. Among 445 women with low serum cholesterol, there were 8 incidents. Calculate the risk difference and its 95% confidence interval.

Solution

p1 = 30/689 = 0.0435

p2 = 8/445 =0.0180

Risk difference = p1-p2 = 0.0255

The 95% CI for p1 that is from 0.0307 to 0.0615

The 95% CI for p2 that is from 0.0091 to 0.0351

The 95 % CI for the difference is from 0.0042 to 0.0456