Descriptive statistics of the variables in the models
| Type of variable | Definition | Number of observations (%) | ||
|---|---|---|---|---|
| Dependent variable | Do you smoke? | |||
| No smoke | 1590 (85.8) | |||
| Yes, less than once a week | 92 (5.0) | |||
| Yes, on weekends | 55 (3.0) | |||
| Yes, smokes daily | 116 (6.3) | |||
| Individual explanatory covariates | Sex: | |||
| Male | 996 (52.3) | |||
| Female | 907 (47.7) | |||
| Interest in school | ||||
| Very little | 329 (17.3) | |||
| Little | 693 (36.5) | |||
| Quite | 657 (34.6) | |||
| High | 222 (11.7) | |||
| Alcohol consumption | ||||
| Never | 1263 (66.6) | |||
| Occasionally or on weekends | 607 (32.0) | |||
| Some times during the week or every day | 27 (1.4) | |||
| Number of smokers living at home | ||||
| Discrete variable | Mean 1.25; SD 1.20 | |||
| Best friend smokes? | ||||
| Yes | 442 (23.5) | |||
| No | 1439 (76.5) | |||
| School characteristics (“context” variables) | Antismoking rules in the schools (number of schools) | Public | Private | Subsidised |
| Weak | 8 | 1 | 1 | |
| Medium/strong | 15 | 3 | 2 | |
| % of academic failure in the school (Grades 1 and 2 of the ESO) | Public | Private | Subsidised | |
| Mean | 50.9 | 97.9 | 90.0 | |
| SD | 18.1 | 2.3 | 8.7 | |
| Median | 46 | 100 | 97 | |
| Min | 21 | 95 | 75 | |
| Max | 100 | 100 | 97 | |