EXTRA CREDIT ASSIGNMENT - Confounding Level 2

1. Table 1: Table showing the relationship between BMI and Type 2 Diabetes.

	Type 2 Diabetes present	Type 2 Diabetes absent	Total
BMI25 (exposed)	163	1,129	1,307
BMI<25 (unexposed)	94	1,262	1,341
Total	257	2,391	2,648

Calculate the crude measure of association.

Group of answer choices

a. RR = 3.52

b. OR = 3.52

c. RR = 1.78

d. OR = 1.78

2. Table 2: Table showing the relationship between BMI and Type 2 Diabetes stratified by age. Age is the confounder.

		Type 2 Diabetes present	Type 2 Diabetes absent	Total
Age(50)	BMI25 (exposed)	145	850	995
BMI<25 (unexposed)	85	1000	108
Age (<50)	BMI25 (exposed)	18	279	297
BMI<25 (unexposed)	9	262	271
Total		257	2,391	2,648

2. Table 3: Table showing the relationship between BMI and Type 2 Diabetes among people Age(50)

	Type 2 Diabetes present	Type 2 Diabetes absent	Total
BMI25 (exposed)	145	850	995
BMI<25 (unexposed)	85	1000	1085

Calculate the relative risk of Type 2 diabetes among individuals older than 50.

Group of answer choices

a. RR = 1.82

b. RR = 1.78

c. RR = 3.52

d. RR = 1.86

Table 4: Table showing the relationship between BMI and Type 2 Diabetes among people Age(<50)

	Type 2 Diabetes present	Type 2 Diabetes absent	Total
BMI25 (exposed)	18	279	297
BMI<25 (unexposed)	9	262	27

3. Calculate the relative risk of Type 2 diabetes among individuals younger than 50.

Group of answer choices

a. RR = 1.82

b. RR = 1.78

c. RR = 1.32

d. RR = 3.52

4. Compare the crude and the stratum specific relative risks. Is age a confounder? Explain why.

Group of answer choices

a. Yes, because the stratum specific RR are different from the crude RR (>10%)

b. No, because the stratum specific RR are similar to the crude RR (<10 %)

c. No, because the stratum specific RR are the same as the crude RR (<10%)

d. Yes, because the stratum specific RR are the same as the crude RR (>10%)

5. In your opinion, what is the benefit of stratification?