Table 1 Descriptive data: frequency of last week heavy and binge drinking, ever cannabis and 'hard' drugs, and of potential confounders.
| Â | Â | N | (%) |
|---|---|---|---|
Outcome variables | Â | Â | Â |
Heavy drinking previous week (age 19) a | Yes | 326 | (32.9) |
| Â | No | 663 | (67.1) |
Binge drinking previous week (age 19) b | Yes | 466 | (46.7) |
| Â | No | 532 | (53.3) |
Ever use of cannabis (age 19) | Ever | 564 | (56.3) |
| Â | Never | 438 | (43.7) |
Ever use of 'hard' drug use (age 19) | Ever | 131 | (13.0) |
| Â | Never | 871 | (87.0) |
Potential confounders | Â | Â | Â |
Gender | Male | 502 | (50.1) |
| Â | Female | 500 | (49.9) |
Parental social class (age 11) | Non-manual | 413 | (41.2) |
| Â | Skilled manual | 299 | (29.9) |
| Â | Semi/unskilled manual | 225 | (22.4) |
| Â | Missing | 65 | (6.5) |
Parental structure (age 15) | Both birth parents | 696 | (70.6) |
| Â | Birth mother/father and new partner | 115 | (11.7) |
| Â | Birth mother/father alone or with other relatives | 174 | (17.7) |
Parental care (age 15) | Low | 254 | (25.4) |
| Â | Medium | 426 | (42.6) |
| Â | High | 319 | (32.0) |
Parental control (age 15) | Low | 364 | (36.7) |
| Â | Medium | 256 | (25.8) |
| Â | High | 373 | (37.5) |
'I take risks' (age 15) | Very untrue | 50 | (5.0) |
| Â | Untrue | 304 | (30.5) |
| Â | True | 539 | (54.0) |
| Â | Very true | 105 | (10.5) |
'I am a rule-breaker' | Very untrue | 250 | (25.1) |
| Â | Untrue | 487 | (49.1) |
| Â | True | 215 | (21.6) |
| Â | Very true | 41 | (4.2) |
'Highers' (age 19) | None | 434 | (43.3) |
| Â | Any | 567 | (56.7) |
Friends' drinking status (age 19) | None - a few | 67 | (6.8) |
| Â | Half or more | 923 | (93.2) |
Friends' use of cannabis (age 19) | None - a few | 777 | (78.9) |
| Â | Half or more | 208 | (21.1) |
Hours per week tv, videos, dvds (age 19) | 0-9 | 166 | (16.8) |
| Â | 10-19 | 349 | (35.5) |
| Â | 20-29 | 277 | (28.1) |
| Â | 30-39 | 98 | (10.0) |
| Â | 40 or more | 94 | (9.5) |