Risk factors of gallstone disease were investigated in male self-defense officials who received, between October 1986 and December 1990, a retirement health examination at the Self-Defense Forces Fukuoka Hospital, Fukuoka, Japan. Some of the data are shown in Table E1.25.
(a) For each of the three factors (smoking, alcohol, and body mass index), rearrange the data into a 3 x 2 table; the other column is for those without gallstones.
(b) For each of the three 3 x 2 tables in part (a), choose the lowest level as the baseline and calculate the odds ratio associated with each other level.
(c) For each of the three 3 x 2 tables in part (a), calculate the generalized odds and give your interpretation. How does this result compare with those in part (b)?
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TABLE E1.25
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|
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Number of Men Surveyed
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|
Factor
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Total
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With Number Gallstones
|
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Smoking
|
|
|
|
Never
|
621
|
11
|
|
Past
|
776
|
17
|
|
Current
|
1342
|
33
|
|
Alcohol
|
|
|
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Never
|
447
|
11
|
|
Past
|
113
|
3
|
|
Current
|
2179
|
47
|
|
Body mass index
(kg/m2)
|
|
|
|
22.5
|
719
|
13
|
|
22.5-24.9
|
1301
|
30
|
|
b25:0
|
719
|
18
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