Table 2 shows the frequency distribution of male cases and controls by average n
ID: 3071231 • Letter: T
Question
Table 2 shows the frequency distribution of male cases and controls by average number of cigarettes smoked per day.
Table 2: Daily cigarette consumption
Daily Number of Cigarettes
Number of Cases
Number of Controls
Odds Ratio
0
7
61
Referent
1–14
565
706
15–24
445
408
25+
340
182
All smokers
1350
1296
Total
1357
1357
Accurately calculate the odds ratios by category of daily cigarette consumption, comparing each category to nonsmokers. Be sure to show your calculations.
Daily Number of Cigarettes
Number of Cases
Number of Controls
Odds Ratio
0
7
61
Referent
1–14
565
706
15–24
445
408
25+
340
182
All smokers
1350
1296
Total
1357
1357
Explanation / Answer
Odd ratio
for daily number of cigrate =0
number of caes=7
number of controls=61
difference=61-7=54
odd ratio=7/54=0.12
for number of cigerate (1-14 )
number of classes=565
number of control =706
diff=706-565 = 141
odd ratio =565/141=4.007
for number of cigerate 15-24
number of cases=445
number of controls=408
difference=37
odd ratio=445/37 = 12.02
for number of cigerate 25+
number of cases=340
number of controls=182
diff=340-182=158
odd ratio=340/158=2.15
for all smokers
number of cases=1350
number of controls=1296
difference=1350-1296=54
odd ratio=1350/54=25
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