Result of effects of mental health and drinking behavior on youth smoking
| Variable | Range | Odds ratio | 95% confidence interval | P-value |
|---|---|---|---|---|
| Sex | Female | - | ||
| Male | 2.959 | 2.770–3.161 | <0.001 | |
| School grade | General high school | - | ||
| Middle school | 0.887 | 0.829–0.948 | <0.001 | |
| Specialized high school | 1.887 | 1.731–2.057 | <0.001 | |
| Academic performance (last a year) |
First | - | - | |
| Second | 1.127 | 1.005–1.263 | 0.041 | |
| Third | 1.321 | 1.184–1.475 | <0.001 | |
| Fourth | 1.774 | 1.586–1.983 | <0.001 | |
| Fifth | 2.587 | 2.290–2.923 | <0.001 | |
| Economic status | First | - | ||
| Second | 0.946 | 0.848–1.054 | 0.314 | |
| Third | 0.896 | 0.808–0.994 | 0.038 | |
| Fourth | 0.992 | 0.876–1.124 | 0.901 | |
| Fifth | 1.118 | 0.931–1.343 | 0.232 | |
| Sexual experience | No | - | ||
| Yes | 3.369 | 3.067–3.700 | <0.001 | |
| Stress recognition | Not feeling at all | - | ||
| Not feeling much | 1.199 | 0.997–1.441 | 0.053 | |
| A little feeling | 1.128 | 0.950–1.339 | 0.170 | |
| A lot of feeling | 1.099 | 0.923–1.298 | 0.267 | |
| A great deal of feeling | 1.135 | 0.952–1.354 | 0.158 | |
| Fatigue recovery (last 7 days) | Very enough | - | ||
| Enough | 1.054 | 0.906–1.227 | 0.493 | |
| Just so-so | 1.179 | 1.025–1.356 | 0.021 | |
| Not enough | 1.222 | 1.061–1.407 | 0.005 | |
| Not enough at all | 1.340 | 1.154–1.555 | <0.001 | |
| Sadness and despair experience (last a year) |
No | - | ||
| Yes | 1.256 | 1.170–1.348 | <0.001 | |
| Suicide thinking (last a year) | No | - | ||
| Yes | 1.415 | 1.297–1.544 | <0.001 | |
| Drinking experience (lifetime) | No | - | ||
| Yes | 7.112 | 6.578–7.688 | <0.001 | |
| Drinking days (last 30 days) | No (last 30 days) | - | ||
| 1–2 (last 30 days) | 1.055 | 0.953–1.167 | 0.300 | |
| 3–5 (last 30 days) | 1.422 | 1.230–1.644 | <0.001 | |
| 6–9 (last 30 days) | 1.660 | 1.380–1.998 | <0.001 | |
| 10–19 (last 30 days) | 1.401 | 1.118–1.754 | 0.003 | |
| 20–29 (last 30 days) | 1.422 | 1.041–1.943 | 0.027 | |
| Everyday | 1.450 | 0.934–2.250 | 0.098 | |
| Average drinking amount at once (last 30 days) |
1–2 (glasses of soju) | - | ||
| 3–4 (glasses of soju) | 1.954 | 1.690–2.258 | <0.001 | |
| 5–6 (glasses of soju) | 2.844 | 2.370–3.414 | <0.001 | |
| 1–2 (bottle of soju) | 3.713 | 3.237–4.259 | <0.001 | |
| More than 2 (bottle of soju) | 3.432 | 2.867–4.109 | <0.001 | |
| Drunk (last 30 days) | No (last 30 days) | - | ||
| 1–2 (last 30 days) | 1.880 | 1.584–2.230 | <0.001 | |
| 3–4 (last 30 days) | 1.162 | 0.778–1.737 | 0.463 | |
| More than 5 (last 30 days) | 3.302 | 2.037–5.353 | <0.001 |
-, not available.
P-values were calculated by multivariate logistic regression analysis.