Rates of high-risk behaviors by age
| Age | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | All ages | OR | P values |
| Positive alcohol toxicology, % (n-tested)* | 0 (3) | 8.3 (12) | 37.5 (8) | 11.1 (18) | 16.7 (36) | 14.0 (43) | 29.1 (55 | 30.4 (56) | 37.3 (51) | 50.0 (60) | 29.2 (342) | 1.34 | 0.001 |
| Positive drug toxicology, % (n-tested)* | 33.3 (3) | 0 (14) | 12.5 (8) | 38.9 (18) | 27.8 (36) | 34.0 (47) | 32.1 (56) | 32.8 (61) | 40.4 (52) | 37.7 (61) | 32.9 (356) | 1.13 | 0.02 |
| Injury due to interpersonal violence, % (N)† | 0 (50) | 4.9 (82) | 5.0 (60) | 9.7 (72) | 12.2 (74) | 16.5 (85) | 16.2 (74) | 27.2 (92) | 22.5 (80) | 20.7 (87) | 14.6 (756) | 1.27 | 0.001 |
| Tobacco use, % (N)† | 0 (50) | 1.2 (82) | 3.3 (60) | 5.6 (72) | 9.5 (74) | 16.5 (85) | 18.9 (74) | 25.0 (92) | 22.5 (80) | 19.5 (87) | 13.2 (756) | 1.34 | 0.001 |
| Overall substance use, % (N)† | 0 (50) | 2.4 (82) | 3.3 (60) | 6.9 (72) | 16.2 (74) | 25.9 (85) | 27.0 (74) | 34.8 (92) | 31.3 (80) | 26.4 (87) | 18.9 (756) | 1.35 | 0.001 |
| Overall alcohol use, % (N)† | 0 (50) | 3.7 (82) | 5.0 (60) | 6.9 (72) | 12.2 (74) | 24.7 (85) | 39.2 (74) | 41.3 (92) | 48.8 (80) | 57.5 (87) | 26.1 (756) | 1.58 | 0.001 |