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. Author manuscript; available in PMC: 2012 Sep 1.
Published in final edited form as: Drug Alcohol Depend. 2011 Feb 9;117(2-3):170–175. doi: 10.1016/j.drugalcdep.2011.01.008

Table 2.

Parameter estimates, confidence intervals, and test statistics from Cox proportional hazards regression analysis predicting number of days retained in treatment to 90 days (N = 349)

Variable Odds Ratio 95% CI (Lower, Upper) Wald χ2 (df=1) p
Demographics
Gender .42 .22 .78 7.56 .006
Race .85 .43 1.68 .22 .637
Age 1.02 .98 1.06 1.07 .302
Baseline variables
Smoked crack/cocaine (Lifetime) .96 .54 1.71 .02 .897
On parole or probation .84 .45 1.58 .28 .595
Medical composite 1.00 .37 2.67 .00 .993
Employment composite 2.67 .79 9.06 2.49 .115
Alcohol composite 1.88 .27 12.96 .41 .520
Drug composite .94 .05 18.03 .00 .967
Legal composite 1.80 .55 5.90 .95 .329
Family/Social composite 1.46 .18 12.09 .12 .727
Psychiatric composite 1.82 .34 9.75 .49 .482
Problem Recognition (PR) .98 .92 1.04 .63 .428
Desire for Help (DH) 1.16 1.04 1.30 6.59 .010
Treatment Readiness (TR) .91 .84 .97 7.78 .005
Program site 4.22 .519

Note: Test statistic for Race was obtained by collapsing data into two categories: White (n = 87) v. Black/Other (n = 264). N = 349 due to missing data for 2 participants.