Table 1.
Age 12 demographic and psychological predictors of SLT initiation by age 18 among never-users at age 12.
| Characteristic at age 12 | SLT Initiation Age: 18 | OR (95% CI)* | p-value | |
|---|---|---|---|---|
| None or less than daily | Daily | |||
| N | 2,235 | 233 | ||
| Experimental Condition | ||||
| Control | 1,185 (91.9%) | 105 (8.1%) | ref | |
| Experimental | 1,050 (89.1%) | 128 (10.9%) | 1.38 (0.83 – 2.27) | 0.21 |
| Participate in Team Sports, n (%) | ||||
| No | 708 (93.2%) | 52 (6.8%) | ref | |
| Yes | 1,527 (89.4%) | 181 (10.6%) | 1.61 (1.21 – 2.14) | 0.001 |
| Parent’s Level of Education, n (%) | ||||
| ≤ High School | 719 (90.3%) | 77 (9.7%) | ref | |
| > High School | 1,351 (90.7%) | 138 (9.3%) | 0.95 (0.63 – 1.42) | |
| Missing | 165 (90.2%) | 18 (9.8%) | 1.00 (0.56 – 1.78) | 0.95 |
| Parent Non-compliance, n (%) | ||||
| 1st Quartile, score = 0 | 366 (88.6%) | 47 (11.4%) | ref | |
| 2nd Quartile, score = 1 | 522 (90.8%) | 53 (9.2%) | 0.82 (0.54 – 1.23) | |
| 3rd Quartile, score = 2 | 606 (89.9%) | 68 (10.1%) | 0.88 (0.59 – 1.31) | |
| 4th Quartile, score = 3+ | 741 (91.9%) | 65 (8.1%) | 0.72 (0.50 – 1.04) | 0.33 |
| Friend Compliance, n (%) | ||||
| 1st Quartile, score = 0 | 586 (93.9%) | 38 (6.1%) | ref | |
| 2nd Quartile, score = 1 | 298 (91.1%) | 29 (8.9%) | 1.45 (0.95 – 2.20) | |
| 3rd Quartile, score = 2 | 253 (91.0%) | 25 (9.0%) | 1.50 (0.98 – 2.29) | |
| 4th Quartile, score = 3+ | 350 (85.4%) | 60 (14.6%) | 2.56 (1.78 – 3.68) | < 0.001 |
| Rebelliousness, n (%) | ||||
| 1st Quartile, score = 0 – 2 | 530 (92.7%) | 42 (7.3%) | ref | |
| 2nd Quartile, score = 3 – 4 | 695 (92.9%) | 53 (7.1%) | 0.95 (0.61 – 1.49) | |
| 3rd Quartile, score = 5 – 6 | 604 (89.6%) | 70 (10.4%) | 1.43 (0.99 – 2.07) | |
| 4th Quartile, score = 7+ | 406 (85.7%) | 68 (14.3%) | 2.16 (1.46 – 3.19) | < 0.001 |
| Thrill-seeking, n (%) | ||||
| 1st Quartile, score = 0 – 1 | 554 (93.7%) | 37 (6.3%) | ref | |
| 2nd Quartile, score = 2 – 3 | 698 (92.2%) | 59 (7.8%) | 1.28 (0.79 – 2.08) | |
| 3rd Quartile, score = 4 | 430 (89.0%) | 53 (11.0%) | 1.80 (1.07 – 3.01) | |
| 4th Quartile, score = 5 + | 553 (86.8%) | 84 (13.2%) | 2.33 (1.45 – 3.75) | < 0.001 |
*
All logistic regression models adjust for experimental condition, age 12 participation in team sports, school grades, and parent education; ref = reference category for odds ratios. P-values are from a Wald’s test of homogeneity in SLT acquisition rates across predictor categories.
Percentages are row-based.