Table 1.
Descriptive statistics of the variables used in the model.
| T1 n (%) |
T2 n (%) |
T3 n (%) |
|
|---|---|---|---|
| Age (years) a | 13.03 (0.52) | 14.16 (0.67) | 15.13 (0.69) |
| Tobacco use | |||
| None | 1,297 (82.9) | 1,284 (82.0) | 1,117 (71.4) |
| 1-2 times | 50 (3.2) | 82 (5.2) | 124 (7.9) |
| 3-5 times | 39 (2.5) | 42 (2.7) | 61 (3.9) |
| 6-9 times | 123 (7.9) | 33 (2.1) | 36 (2.3) |
| 10-19 times | 19 (1.2) | 36 (2.3) | 47 (3.0) |
| 20-39 times | 14 (0.9) | 25 (1.6) | 59 (3.8) |
| 40 times or more | 23 (1.5) | 63 (4.0) | 121 (7.7) |
| Alcohol use | |||
| None | 857 (54.8) | 732 (46.8) | 439 (28.1) |
| 1-2 times | 317 (20.30) | 328 (21.0) | 303 (19.4) |
| 3-5 times | 121 (7.7) | 167 (10.7) | 214 (13.7) |
| 6-9 times | 99 (6.3) | 115 (7.3) | 123 (7.9) |
| 10-19 times | 98 (6.3) | 91 (5.8) | 186 (11.9) |
| 20-39 times | 24 (1.5) | 69 (4.4) | 147 (9.4) |
| 40 times or more | 49 (3.1) | 63 (4.0) | 153 (9.8) |
| Cannabis use | |||
| None | 1,467 (93.7) | 1,386 (88.6) | 1,248 (79.7) |
| 1-2 times | 39 (2.5) | 75 (4.8) | 110 (7.0) |
| 3-5 times | 18 (1.2) | 29 (1.9) | 46 (2.9) |
| 6-9 times | 8 (0.5) | 12 (0.8) | 24 (1.5) |
| 10-19 times | 9 (0.6) | 19 (1.2) | 34 (2.2) |
| 20-39 times | 13 (0.8) | 17 (1.1) | 25 (1.6) |
| 40 times or more | 11 (0.7) | 27 (1.7) | 78 (5.0) |
| Intoxication episodes | |||
| None | 1,500 (95.8) | 1,452 (92.8) | 1,327 (84.8) |
| 1-2 times | 43 (2.7) | 84 (5.4) | 170 (10.9) |
| 3-5 times | 17 (1.1) | 19 (1.2) | 34 (2.2) |
| 6-9 times | 1 (0.1) | 7 (0.4) | 9 (0.6) |
| 10-19 times | 3 (0.2) | 0 (0.0) | 23 (1.5) |
| 20-39 times | 1 (0.1) | 3 (0.2) | 2 (0.1) |
| RAPIa | 0.66 (3.39) | 1.13 (4.37) | 2.19 (5.39) |
Note. RAPI = Rutgers Alcohol Problem Index.
a
Mean (Standard Deviation).