Table 1.
Prevalence of substance use among young adults aged 18–22 years in 2005–2006 (n=20,858)
| Substance use Column % (SE) |
College students n=10,473 |
Non-students n=10,385 |
|---|---|---|
| Substance use in the past year | ||
| MDMA | 3.2 (0.24) | 4.7 (0.29)b |
| Alcohol | 80.9 (0.53) | 74.4 (0.70)b |
| Marijuana | 31.0 (0.61) | 30.6 (0.57) |
| Cocaine/crack | 5.9 (0.33) | 8.5 (0.38)b |
| Methamphetamine | 1.0 (0.14) | 2.0 (0.21)b |
| Age at onset of MDMA use, lifetime | ||
| ≤17 years | 4.6 (0.28) | 8.1 (0.34)b |
| ≥18 years | 4.1 (0.29) | 7.3 (0.36) |
| Age at onset of any drug use, lifetimec | ||
| ≤17 years | 41.5 (0.61) | 51.5 (0.56)b |
| ≥18 years | 14.0 (0.44) | 10.7 (0.36) |
| Age at onset of alcohol use, lifetime | ||
| ≤17 years | 64.4 (0.71) | 63.2 (0.67)a |
| ≥18 years | 21.8 (0.60) | 20.2 (0.43) |
SE, standard error.
Sample sizes are unweighted numbers; proportions are weighted figures.
a
χ2 test by college-attending status: P≤0.01
b
χ2 test by college-attending status: P≤0.001.
c
Age at first use of marijuana, inhalants, cocaine/crack, hallucinogens, heroin or first non-medical use of prescription pain relievers, sedatives, tranquilizers or stimulants.