Answers
| Number of Persons at Start of study | Number of Observed New Cases of Duodenal Ulcers | Total | |
| Current smokers | 4,754 | 16 | 4770 |
| Nonsmokers | 22,295 | 60 | 22,355 |
| Total | 27,049 | 76 |
The incidence of exposed is
The Incidence of non exposed
So, the Relative Risk among current smokers and nonsmokers is
The risk is almost same for both group
its means there is no significant chance of duodenal ulcer among current smokers than none smokers.
There is no association between current smoking and duodenal ulcer
| Number of Persons at Start of study | Number of Observed New Cases of Duodenal Ulcers | Total | |
| Past smokers | 20,757 | 60 | 20,817 |
| Nonsmokers | 22,295 | 60 | 22.355 |
| Total | 43,052 | 120 |
The incidence of exposed is
The incidence of non exposed is
So, the Relative Risk among past smokers and nonsmokers is
the risk is the same for both of group
So, there is no association between Past smoking and duodenal ulcer
4754: (4754 +16) = 0.996
22. 295 : (22, 295 +60) = 0.997
0.996 0.997 = 0,998
20.757 : (20.757 +60) = 0.997
22. 295 : (22, 295 +60) = 0.997
0.997:0.997=1
.
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