Question: We are now examining the relationship between smoking and stroke. We suspect that the relationship between smoking and stroke may be different in older women

We are now examining the relationship between smoking and stroke. We suspect that the relationship between smoking and stroke may be different in older women (>70) compared to younger women (<=70). Examining the table below calculate the Mantel-Haenszel estimate of the RR. Next perform the test for a common relative risk across all strata. What do you conclude from this test? Lastly provide the log of the risk of stroke for smokers and non-smokers in younger and older women. Looking at these four risks what type of interaction is present?

	Younger women (<=70)	Older women (>70)
smoking	Stroke	Controls	Total	Stroke	Controls	Total
Yes	70	2065	2135	7	48	55
No	50	3459	3509	9	37	46
Total	120	5524	5644	16	85	101

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