Table 3. Univariate and multivariate analysis of risk factors associated with smoking.
| Univariate analyses All |
Multivariate analyses | |||||||
|---|---|---|---|---|---|---|---|---|
| All | Male | Female | ||||||
| OR | 95% CI | aOR | 95% CI | aOR | 95% CI | aOR | 95% CI | |
| Sex | 1.00 | 0.99–1.01 | 0.99 | 0.99–1.01 | NA | NA | ||
| Age | 1.01 | 0.99–1.03 | 0.98 | 0.95–1.02 | 1.09 | 0.94–1.26 | 0.99 | 0.93–1.06 |
| School grade | 1.03 | 1.00–1.05 | 0.98 | 0.96–1.05 | 0.97 | 0.85–1.11 | 0.97 | 0.87–1.09 |
| Knowledge | 1.48 | 1.22–1.79 | 1.33 | 1.09–1.62 | 1.18 | 0.87–1.61 | 1.51 | 1.14–1.99 |
| Self-image and peer-pressure | 3.24 | 2.79–3.76 | 3.13 | 2.67–3.66 | 2.85 | 2.27–3.56 | 3.16 | 2.5–4.00 |
| Intentions to smoke | 1.43 | 1.22–1.66 | 1.81 | 1.67–2.11 | 1.24 | 0.96–1.60 | 1.05 | 0.81–1.37 |
| Perceived prevalence; exposure to smoking by peers & family & access to tobacco products | 1.42 | 1.13–1.89 | 1.31 | 1.10–1.57 | 0.93 | 0.70–1.24 | 1.69 | 1.52–1.91 |
| Exposure to media adverts | 1.34 | 1.11–1.60 | 1.19 | 1.01–1.40 | 1.06 | 0.81–1.39 | 1.55 | 1.18–2.03 |
| Culture and environment | 1.28 | 1.09–1.51 | 1.08 | 0.98–1.19 | 1.51 | 1.14–1.99 | 1.21 | 0.94–1.57 |
OR = Odds Ratio
aOR = adjusted Odds Ratio
CI = Confidence Interval