Table 5.
Substance use in NCANDA sample by sex, age group, and for non-/low (NON) drinkers (n = 692) and drinkers who exceeded thresholds (ET; n = 139) at baseline
| Lifetime days drinking |
Lifetime cigarettes smoked |
Lifetime days marijuana use |
|||||||
| Age, in years | Male M (SD) | Female | % sample | Male M (SD) | Female M (SD) | % sample | Male M (SD) | Female M (SD) | % sample |
| NON drinkers | |||||||||
| 12–14 | 2.0 (2) | 2.0 (1) | 3% | 1 | – | 1% | 4.7 (5) | 10.0 (13) | 1% |
| 15–17 | 5.2 (6) | 4.2 (4) | 24% | 5.5 (5) | 1 | 5% | 5.7(5) | 7.8 (9) | 13% |
| 18–21 | 7.0 (10) | 7.7 (10) | 43% | 6.9 (13) | 9.6 (15) | 15% | 5.2(5) | 4.5 (4) | 17% |
| Total | 5.6 (7) | 5.7 (8) | 18% | 5.7(9) | 7.2 (13) | 5% | 5.5 (5) | 6.4 (7) | 9% |
| ET drinkers | |||||||||
| 12–14 | 5.5 (4) | 12.3 (12) | 100% | – | 3 | 17% | – | 18.0 (24) | 33% |
| 15–17 | 17.0 (24) | 11.4 (8) | 100% | 45.8 (103) | 7.0 (13) | 27% | 16.1 (32) | 18.9 (38) | 76% |
| 18–21 | 82.5 (103) | 66.4 (73) | 100% | 96.7 (228) | 22.1 (51) | 37% | 185.9 (440) | 50.0 (144) | 66% |
| Total | 53.6 (85) | 46.6 (64) | 100% | 79.7 (194) | 17.6 (44) | 32% | 106.7 (330) | 38.6 (117) | 68% |
Note: NCANDA = National Consortium on Alcohol and NeuroDevelopment in Adolescence.