To assess the relationship between depression and obesity among teenagers, a study was carried out to determine whether depression might be a risk factor. The study involved cases of high school students with a current diagnosis of depression, and healthy controls (students without a diagnosis of clinical depression). The results were stratified based on the occurrence of any previous depressive episode among the participants. The following tables indicate the results

Previous depressive episode:

	Obesity	No Obesity	Total
Depression	25	50	75
No depression	15	50	65
Total	40	100	140

No previous depressive episode:

	Obesity	No Obesity	Total
Depression	2	50	52
No depression	15	600	615
Total	17	650	667

1. The appropriate measure of association to be calculated is the ___________.

Group of answer choices

odds-ratio

relative risk

prevalence ratio

confidence interval

none of the above

2. What is the crude OR relating obesity to depression?

Group of answer choices

1.8

2.8

3.8

5.8

it is not appropriate to calculate the OR

3. What is the OR for those with a previous depressive episode?

Group of answer choices

1.7

2.6

3.6

4.6

it is not appropriate to calculate the OR

4. What is the OR for those without a previous depressive episode?

Group of answer choices

1.6

2.6

3.6

4.6

it is not appropriate to calculate the stratum-specific OR

5. If the analysis was continued to find the Mantel-Haenszel (MH)] estimate of the odds ratio, and for the purpose of this course that it can be estimated as the "average" of the stratum-specific odds ratios, this would be considered:

Group of answer choices

a crude OR

a stratum-specific OR

an adjusted OR

there is no such thing

6. Can you say based on the calculations whether previous depressive episode is a confounder?

Group of answer choices

Yes

No