Smoking by young teenagers. Ordered logistic regression model estimation results
| Categories | Frequency (%) | |
|---|---|---|
| Effective sample size: 1697. The odds ratios are calculated to compare “smokes daily” with “does not smoke”. Dependent variable, 0 for no smoke, 1 for smoke less than once a week, 2 for smoke on weekends, 3 for smokes daily. Variables contents: sex (0 male; 1 female), interest in school (ordinal for interest in school; 1 very little; 2 little; 3 quite; 4 high), alcohol consumption occasionally (1 yes; 0 no), alcohol consumption frequently (1 yes; 0 no), Smokers at home (percentage of smokers at home), best friend smokes (1 yes; 0 no). Odds ratios 95% confidence intervals in parentheses. *Odds ratios for categories extremes, smokes daily versus no smoke. | ||
| Dependent variable | ||
| “Do you smoke?” | No smoke | 1456 (85.8) |
| Yes, less than once a week | 83 (4.9) | |
| Yes, on weekends | 48 (2.8) | |
| Yes, smokes daily | 110 (6.5) | |
| Explanatory variables | Unadjusted odds ratios | Adjusted odds ratios (95% CI) |
| Sex (female/male*) | 1.75 | 1.85 (1.33 to 2.59) |
| Interest in school (high/very little*) | 0.17 | 0.23 (0.19 to 0.27) |
| Alcohol consumption (occasionally/never*) | 21.74 | 5.88 (3.95 to 8.75) |
| Alcohol consumption (more than once a week/never*) | 58.30 | 9.81 (6.12 to 15.75) |
| Number of smokers at home (one/none*) | 1.77 | 2.03 (1.22 to 3.36) |
| Best friend smokes (yes/no*) | 24.74 | 6.96 (4.93 to 9.84) |
| Log likelihood | −696.0774098 | |
| χ2 for covariates | p=0.0001 | |