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. Author manuscript; available in PMC: 2014 Mar 1.
Published in final edited form as: JAMA Psychiatry. 2013 Mar;70(3):325–333. doi: 10.1001/jamapsychiatry.2013.282

Table 3.

Comparison of Australian Twin Registry controls (N=1495) with neighborhood controls not dependent on illicit drugs (N=340)

Control group Prevalence of illicit drug use by control group
Cannabis Stimulant Opioid Sedative Cocaine Any illicit Any non-cannabis
ATR 44.4 % 6.8 % 7.4 % 3.5 % 2.3 % 49.8 % 15.0 %
Nondependent Neighborhood 71.1 % 44.4 % 10.6 % 12.9 % 25.9 % 79.1 % 50.6 %
Odds-ratio (95% CI) 4.22 (3.21–5.54) 10.91 (8.14–14.63) 1.49 (1.00–2.22) 4.12 (2.71–6.28) 14.57 (9.63–22.03) 3.81 (2.88–5.05) 5.78 (4.48–7.46)

Abbreviations: ATR, Australian Twin Registry; OR, odds ratio