In a small cohort study investigating the effect of a rare exposure ( E), the following results were found:
Table 1 Disease
A- Is there an association between exposure and disease? Show the way you reached the conclusion. [2 points]
B- A stratified analysis by Age-groups shows the following:
Younger adults Older adults
No Exposure Yes No
30 90 Yes 40 80
40 80 No 30 90
c- How do you explain this result? (No more than 60 words) [4 points]
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