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. Author manuscript; available in PMC: 2016 Oct 1.
Published in final edited form as: Drug Alcohol Depend. 2015 Aug 10;155:134–140. doi: 10.1016/j.drugalcdep.2015.08.001

Table 3.

GEE Model for Change in Cigarettes per Day (Baseline vs Final 30 Days of Treatment)

Variable Estimate SE p-value
Intercept 0.06 3.56 0.99
Group 5.21 1.59 <0.01
Time 5.80 1.59 <0.001
Group*Time −4.02 1.81 0.03
Age 0.19 0.08 0.02
Sex 2.09 1.63 0.20
Race −2.37 1.50 0.11
Cannabis Use −0.02 0.09 0.83

Note: GEE: Generalized Estimating Equations. Group is current study (N = 32) vs. historical control (N = 54), Race is white vs. other, cannabis use refers to the mean number of days of cannabis and tobacco use during the 30 days prior to intake.