Substance Lifetime use (%) (n=70) Age at first use among users (SD) Usage last month (OTI) OTI mean among users in past month (SD)
      n %  
Alcohol 100.0 15.8 (4.2) 70 100 8.6 (6.1)
Tobacco 84.3 15.0 (4.9) 36 51.4 15.9 (11.2)
Cannabis 64.3 18.4 (6.3) 15 21.4 6.7 (17.6)
Amphetamines 36.6 24.1 (5.2) 6 8.5 0.1 (0.1)
Tranquilisers 12.9 29.0 (8.7) 3 4.3 0.1 (0.1)
Hallucinogens 32.9 20.8 (4.8) 0 0.0 NA
Other opiates 7.1 20.0 (0.0) 0 0.0 NA
Heroin 14.3 22.4 (8.3) 0 0.0 NA
Inhalants 7.1 19.4 (3.4) 0 0.0 NA
Cocaine 15.7 22.4 (3.6) 0 0.0 NA
Barbiturates 5.7 22.3 (5.6) 0 0.0 NA
Table 2: Patterns of substance use assessed at baseline.