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. Author manuscript; available in PMC: 2009 Sep 1.
Published in final edited form as: Drug Alcohol Depend. 2008 May 16;97(1-2):122–129. doi: 10.1016/j.drugalcdep.2008.03.026

TABLE 3.

Baseline variables associated with opioid and cocaine use during treatment

Variable Opioid Use During Treatment Cocaine Use During Treatment

Opioid-negative urine samples
%
Unadjusted OR1
(95% CI3)
Adjusted OR2
(95% CI3)
Cocaine-negative urine samples % Unadjusted OR1
(95% CI3)
Adjusted OR2
(95% CI3)

Age
  ≤38 72 1.17 (0.87–1.57) 1.76 (1.27–2.45)6 69 1.09 (0.80–1.49) 1.57 (1.10–2.25)
  >38 77 72

Gender
  Female 76 1.11 (0.83–1.50) 1.18 (0.80–1.73) 73 1.10 (0.80–1.50) 1.24 (0.83–1.87)
  Male 73 69

Race
  African American 73 1.35 (1.00–1.83) 1.16 (0.82–1.63) 68 1.59 (1.16–2.18) 1.48 (1.04–2.11)
  White 77 75

Employment status
  Employed 80 1.68 (1.19–2.38) 1.10 (0.75–1.62) 80 2.18 (1.52–3.14) 1.63 (1.07–2.48)
  Unemployed 73 68

Referral source
  SEP4 63 2.57 (1.86–3.56) 1.46 (0.96–2.20) 57 2.76 (1.93–3.95) 1.43 (0.94–2.19)
  Other5 78 75

Days of heroin use in month prior to intake -- --
  0–29 days 85 3.51 (2.59–4.76) 2.81 (1.95–4.05) -
  30 days 65 -

Days of injecting heroin in month prior to intake -- --
  0 days 86 2.70 (1.85–3.93) 1.79 (1.14–2.82) -
  1–30 days 70 -

Days of cocaine use month prior to intake
  0–29 days - -- -- 75 4.19 (2.83–6.21) 2.58 (1.61–4.13)
  30 days - 42

Days of IV cocaine month prior to intake
  0 days - -- -- 86 3.67 (2.45–5.49) 3.15 (1.93–5.13)
  1–30 days - 65
1

Unadjusted Odds Ratio

2

Adjusted for all baseline variables listed in the table

3

CI: Confidence Interval

4

SEP: Syringe Exchange Program referral source

5

Other: Referral from sources other than SEP

6

Bolded text indicates statistically significant relationship.