TABLE 2. Pre–Post Data on the SCL-90R GSI for the Treated (n = 61) and the Waiting-List (n = 61) Groups


 t1
 t2
 WES
GSI
 GSI
 GSI
Treated group 0.90 (0.48) 0.71 (0.52) –0.38**
Waiting-list group
 1.12 (0.58)
 0.99 (0.62)
 –0.22*

Note. WES = within-subject effect size; GSI = Global Severity Index. t1: assessments at time 1. For the treated group, t1 is right before the intake interview. For the waiting-list group, t1 is 1 month before the BPI. t2: assessments at time 2. For the treated group, t2 is after the last BPI session. For the waiting-list group, t2 is right before the intake interview.

* p = .01.

** p = .001.