Table 4 |
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|
Two part model of the quantity of cigarettes smoked in a month |
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|
Part 1: P(nb cig > 0) N = 721 |
Part 2: log(nb cig) N = 245 |
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|
Variable |
OR |
β/σ |
exp(β) |
β/σ |
||
|
|
||||||
|
Academic discipline (ref = sociology) |
||||||
|
• English as a foreign language |
1.0318 |
0.09 |
||||
|
• Medicine |
- |
0.4828 |
-3.25 |
** |
||
|
• Nursing |
0.6809 |
-2.16 |
||||
|
Perceived approval of regular smoking by friends (ref = strong disapproval) |
||||||
|
• Approval |
4.5358 |
5.08 |
*** |
2.9571 |
3.41 |
** |
|
• Disapproval |
1.6844 |
2.13 |
* |
2.4925 |
6.28 |
*** |
|
Perceived proportion of friends smoking (ref = none) |
||||||
|
• <33% |
1.2195 |
0.52 |
||||
|
• Half |
3.4953 |
3.13 |
** |
- |
||
|
• >66% |
2.6591 |
2.61 |
** |
|||
|
Smoke discomfort in university (ref = never) |
||||||
|
• Seldom |
0.4227 |
-2.15 |
* |
0.6747 |
-2.33 |
* |
|
• Sometimes |
0.2606 |
-3.18 |
** |
0.2849 |
-4.45 |
** |
|
• Often |
0.1572 |
-3.19 |
** |
0.1264 |
-4.29 |
** |
|
Position about smoke-free universities (ref = against) |
||||||
|
• Indifferent |
0.2288 |
-2.62 |
** |
0.5718 |
-2.98 |
* |
|
• Mostly for |
0.1506 |
-3.99 |
*** |
0.5687 |
-1.99 |
|
|
• Totally for |
0.0756 |
-6.54 |
*** |
0.4794 |
-3.52 |
** |
|
Tobacco perception score (high scores = positive perceptions) |
1.1635 |
3.63 |
*** |
- |
||
|
Beliefs about tobacco industry score (high scores = negative beliefs) |
- |
1.0342 |
2.26 |
* |
||
|
Binge drinking (ref = no) |
||||||
|
• Occasional (< 4 times/month) |
2.9303 |
2.54 |
* |
- |
||
|
• Weekly (≥ 4 times/month) |
1.3186 |
0.39 |
||||
|
Cannabis use (ref = no use) |
||||||
|
• Occasional (≤ 1/week) |
3.4140 |
3.62 |
*** |
- |
||
|
• Regular (> 1/week) |
8.2666 |
2.13 |
* |
|||
|
Gender (ref = male) |
2.7103 |
2.80 |
** |
- |
||
|
Age |
- |
1.0366 |
3.13 |
* |
||
|
Constant (exponentiated) |
0.2899 |
-1.40 |
30.9910 |
8.22 |
*** |
|
|
Duan's smearing estimator |
Not applicable |
2.2494 |
Not applicable |
|||
|
|
||||||
|
*** p < 0.001; ** p < 0.010; * p < 0.050 Notes: Only independent variables with a bootstrap-estimated, backward selection inclusion probability ≥ 80% were included in each part of the model; - = variable not included; OR = odds ratio; β/SE = Wald test statistic (β = regression coefficient, σ = standard error of the coefficient). Part 1 models the probability of being a smoker using logistic regression, part 2 models the log-number of cigarettes smoked in a month by smokers using linear regression. |
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|
Riou França et al. Substance Abuse Treatment, Prevention, and Policy 2009 4:4 doi:10.1186/1747-597X-4-4 |
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