Question 2: Confounding and Interaction (24 points)

From the summary table below, suggest whether there is presence of confounding and interaction, no confounding, and no interactions, or confounding and no interactions.

Example	Study (Effect Measure)	Adjusted vs. Crude
		Stratum 1 Estimate	Stratum 2 Estimate	Crude Estimate
1	Longitudinal (RR)	1.02	1.86	4.00
2	Longitudinal (RR)	1.74	3.00	1.00
3	Case-control (OR)	0.96	0.45	1.83
4	Longitudinal (RR)	4.00	4.00	4.00
5	Longitudinal (RR)	1.00	1.00	1.00
6	Case-control (OR)	1.83	1.83	1.83
7	Longitudinal (RR)	4.00	4.00	4.00
8	Longitudinal (RR)	1.00	1.00	1.00
9	Case-control (OR)	1.83	1.83	1.83
10	Longitudinal (RR)	1.01	1.03	4.00
11	Longitudinal (RR)	3.00	3.00	1.00
12	Case-control (OR)	0.83	0.83	1.83