Table 3B.
Age at first opportunity, among all participants (weighted for sampling design, Nwt=3,285)
| Marijuana | Inhalants | Hallucinogens | Cocaine | Meth | Heroin | Stimulants | Analgesics | Tranquilizers | Ecstasy | |
|---|---|---|---|---|---|---|---|---|---|---|
|
|
||||||||||
| %wt <15 | 17.7 | 2.6 | 1.8 | 0.4 | 1.0 | 0.1 | 1.5 | 0.9 | 0.7 | 1.9 |
| %wt 15 to 17 | 49.6 | 7.2 | 17.8 | 8.8 | 7.3 | 1.4 | 17.1 | 17.0 | 8.9 | 14.9 |
| %wt 18 to 21 | 19.8 | 10.6 | 27.1 | 25.8 | 10.9 | 3.8 | 42.9 | 23.5 | 13.7 | 20.1 |
| %wt 22 or older | 3.0 | 3.1 | 4.9 | 7.7 | 3.0 | 0.7 | 4.0 | 5.8 | 7.9 | 5.9 |
| %wt Never | 9.8 | 76.5 | 48.4 | 57.2 | 77.8 | 94.0 | 34.5 | 52.8 | 68.8 | 57.2 |
| Total | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
Note. Data on amphetamines and methamphetamines were combined under “meth” to reflect the earliest age at which participants had the opportunity to use either drug. Stimulants, analgesics, and tranquilizers were opportunity for nonmedical use only; does not include medically supervised use. For tabulating weighted results in Table 3B among the overall sample, missing follow-up data were treated as no opportunity; therefore, results represent minimum estimates.