Table 3A.
Age at first opportunity, among participants who ever had the opportunity (unweighted)
| Marijuana | Inhalants | Hallucinogens | Cocaine | Meth | Heroin | Stimulants | Analgesics | Tranquilizers | Ecstasy | |
|---|---|---|---|---|---|---|---|---|---|---|
| % (n) <15 | 25.5 (301) | 10.4 (39) | 3.7 (28) | 1.2 (8) | 4.8 (16) | 2.2 (2) | 3.4 (31) | 2.0 (14) | 2.8 (14) | 5.0 (32) |
| % (n) 15 to 17 | 59.0 (696) | 34.7 (130) | 41.5 (316) | 25.0 (166) | 36.4 (121) | 27.5 (25) | 32.6 (297) | 41.9 (299) | 32.1 (160) | 39.3 (253) |
| % (n) 18 to 21 | 13.7 (162) | 44.8 (168) | 48.4 (369) | 60.0 (399) | 46.4 (154) | 57.1 (52) | 59.1 (539) | 47.0 (335) | 43.8 (218) | 43.2 (278) |
| % (n) 22 or older | 1.8 (21) | 10.1 (38) | 6.4 (49) | 13.8 (92) | 12.3 (41) | 13.2 (12) | 4.9 (45) | 9.1 (65) | 21.3 (106) | 12.4 (80) |
| Total | 100.0 (1180) | 100.0 (375) | 100.0 (762) | 100.0 (665) | 100.0 (332) | 100.0 (91) | 100.0 (912) | 100.0 (713) | 100.0 (498) | 100.0 (643) |
| Mean (SD) | 15.8 (2.1) | 17.9 (2.9) | 17.9 (2.1) | 19.1 (2.2) | 18.4 (2.5) | 18.9 (2.3) | 18.2 (2.1) | 18.2 (2.3) | 19.0 (2.8) | 18.3 (2.7) |