Question

you conduct a cohort study in which you follow 800 participations; 450 have cholesterol levels over 150 mg/dl (i.e high cholesterol) and 350 do not have high cholesterol. among those with high cholesterol, 124 developed coronary heart disease (chd); whereas, only 41 without high cholesterol develop chd. completely fill in the 2x2 table below
a = enter answer
b = enter answer
c = enter answer
d = enter answer

Explanation:

Step1: Determine value of A

A represents the number of high - cholesterol participants with CHD. Given as 124.

Step2: Determine value of B

B = High - cholesterol total - A. High - cholesterol total is 450. So \( B=450 - 124=326 \)

Step3: Determine value of C

C represents the number of low - cholesterol participants with CHD. Given as 41.

Step4: Determine value of D

D = Low - cholesterol total - C. Low - cholesterol total is 350. So \( D = 350-41 = 309 \)

Answer:

\( A = 124 \)
\( B = 326 \)
\( C = 41 \)
\( D = 309 \)