Table 2.
Prevalence of individual risk behaviors over time in intervention and control adolescents.
| Behavior | Intervention | Control | Logistic regression, P valuea | ||||
|
|
Baseline (n=145), n (%) | 3 months (n=138), n (%) | 6 months (n=139), n (%) | Baseline (n=155), n (%) | 3 months (n=145), n (%) | 6 months (n=145), n (%) |
|
| Low fruit or vegetable intake | 115 (79.3) | 106 (76.8) | 98 (70.5) | 132 (85.1) | 118 (81.4) | 111 (76.6) | .93 |
| Low sleep time | 46 (31.7) | 52 (37.7) | 65 (46.8) | 54 (34.8) | 55 (37.9) | 72 (49.6) | .89 |
| Low physical activity | 39 (26.9) | 44 (31.9) | 36 (25.9) | 50 (32.3) | 52 (35.9) | 51 (35.2) | .77 |
| Inconsistent helmet use | 37 (25.5) | 24 (17.4) | 22 (15.8) | 39 (25.2) | 25 (17.2) | 20 (13.8) | .54 |
| High sugary beverage intake | 28 (19.3) | 39 (28.2) | 36 (25.9) | 36 (23.2) | 37 (25.5) | 35 (24.1) | .47 |
| Depression | 13 (9.0) | 15 (10.9) | 14 (10.1) | 23 (14.8) | 15 (10.3) | 18 (12.4) | .24 |
| Inconsistent seatbelt use | 16 (11.0) | 7 (5.1) | 11 (7.9) | 10 (6.5) | 7 (4.8) | 10 (6.9) | .11 |
| Texting while driving | 9 (5.8) | 10 (7.2) | 8 (5.8) | 13 (8.4) | 8 (5.5) | 10 (6.9) | —b |
| Marijuana use | 10 (6.9) | 4 (2.9) | 3 (2.2) | 7 (4.5) | 4 (2.8) | 5 (3.4) | — |
| Alcohol use | 8 (5.5) | 3 (2.2) | 4 (2.9) | 6 (3.9) | 4 (2.8) | 4 (2.8) | — |
| Tobacco use | 4 (2.8) | 0 (0.0) | 1 (0.7) | 4 (2.6) | 2 (1.4) | 3 (2.1) | — |
| Sexual risk | 1 (0.7) | 3 (2.2) | 3 (2.2) | 4 (2.6) | 2 (1.4) | 3 (2.1) | — |
| Driving under the influence | 0 (0.0) | 0 (0.0) | 0 (0.0) | 2 (1.3) | 1 (0.7) | 0 (0.0) | — |
aP values were based on the likelihood ratio test comparing mixed effects logistic regression with and without period-by-group interaction. Both models controlled for random effects corresponding to within-individual clustering.
bOwing to concerns about estimate instability, we did not conduct analyses for individual behaviors in which fewer than 10 adolescents per study arm endorsed the behavior.