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. Author manuscript; available in PMC: 2014 Oct 1.
Published in final edited form as: Drug Alcohol Depend. 2013 Apr 28;132(3):528–534. doi: 10.1016/j.drugalcdep.2013.03.020

Table 3.

Unstandardized regression coefficients and p-values for Models 1–3.

Predictors Model 1 Model 2 Model 3
B p Beta p Beta p
CM (vs. standard treatment) 1.91 <.001 1.94 <.001 1.75 <.001
Income during treatment period −0.09 .54 −0.15 .33 −0.19 .18
Interaction: treatment condition x income 0.05 .75 0.13 .42 0.20 .21
Income type
 Earned - - 0.56 .18 0.03 .94
 Public assistance - - 1.22 .007 1.77 <.001
 Illegal - - −1.98 .007 −1.66 .02
Married, cohabitating, or remarried (vs. other) - - - - 0.64 .26
Caucasian (vs. other) - - - - −0.15 .71
Female - - - - −0.70 .07
Cocaine positive sample at treatment initiation - - - - −2.97 <.001
Years of education - - - - 0.28 .004
Years of cocaine use - - - - −0.04 .17
Adjusted R2 0.04 0.07 0.17

Note. CM = contingency management.