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. Author manuscript; available in PMC: 2011 Jun 27.
Published in final edited form as: Clin Trials. 2009 Jun;6(3):252–260. doi: 10.1177/1740774509105224

Table 5.

Summary of models

Models Variable Odds Ratio 95% C.L. p-value
Model 1: Client Race/ethnicity
Primary drug of abusea < 0.001
Heroin/methadone/opiates 1.4 0.65, 3.04
Cocaine 0.84 0.48, 1.47
Cannabis 1.2 0.62, 2.32
Other drug 1.04 0.63, 1.73
Polydrug 0.64 0.36, 1.14
Alcohol-drug duo 0.79 0.4, 1.55
Alcohol 1.21 0.64, 2.27
No problem or nicotine 1.0
Age
Age by race/ethnicity 0.05
Model 2: Program-client Primary drug of abuse < 0.001
Heroin/methadone/opiates 1.58 0.81, 3.08
Cocaine 0.87 0.49, 1.53
Cannabis 1.42 0.68, 2.2
Other drug 1.22 0.68, 2.2
Polydrug 0.63 0.37, 1.08
Alcohol-drug duo 0.72 0.4, 1.32
Alcohol 1.14 0.64, 2.03
No problem or nicotine 1.0
Age _1.03 1.01, 1.04_ _< 0.001
HIV risk screening < 0.001
Yes 3.49 2.51, 4.85
No 1.0
% female admissions 0.002
≤20% 5.21 2.11, 12.91
21-80% 2.08 1.23, 3.5
>80% 1.0
a

We chose `no problem or nicotine' as the reference group for primary drug of abuse based on clinical relevance, as we were interested comparisons to the least serious drug of abuse group.