Skip to main content
. Author manuscript; available in PMC: 2015 Mar 1.
Published in final edited form as: Drug Alcohol Depend. 2014 Jan 3;136:69–78. doi: 10.1016/j.drugalcdep.2013.12.017

Table 3.

Estimated impact of an additional episode of each treatment relative to no treatment based on IPT weighted regression versus traditional unweighted regression models. Model A is unadjusted and only includes the treatment group indicators; Model B adjusts for baseline confounders; Model C adjusts for baseline and time-varying confounders including previous treatment indicators.

Traditional Unweighted Regression Models
IPTW Model A Model B Model C
Substance Frequency Scale at 12 months
    BDS only −1.1 (−2.0,−0.3) −0.9 (−1.7,−0.2) −1.1 (−1.8,−0.4) −1.1 (−2.2,−0.1)
    Outpatient −0.9 (−1.8,0.0) −1.2 (−1.9,−0.5) −1.3 (−2.0,−0.6) −1.7 (−3.1,−0.2)
    Residential −1.6 (−2.5,−0.7) −1.0 (−1.7,−0.4) −2.3 (−2.9,−1.6) −4.0 (−5.7,−2.2)
Substance Problem Scale at 12 months
    BDS only −0.5 (−4.0,3.1) −0.4 (−3.2,2.5) −1.5 (−4.3,1.3) −1.7 (−6.4,3.0)
    Outpatient −0.9 (−4.3,2.5) −1.4 (−4.4,1.6) −2.2 (−5.0,0.7) −3.0 (−8.9,3.0)
    Residential −1.5 (−4.9,1.9) 2.6 (−0.3,5.4) −3.3 (−6.3,−0.4) −8.2 (−15.8,−0.7)