Table 2.
Means and standard deviations of outcome measures administered at the screening, at postcontrol period, and at posttreatment, effect sizes d, and t values resulting from the paired t tests of the differences in improvement during control and during treatment
| Screening/ Precontrol n = 24 |
Postcontrol/ Pretreatment n = 24 |
Posttreatment n = 24 |
Test of Difference | |||||||
| Measure | Mean | SD | Mean | SD | d | Mean | SD | d | t23 | P |
| IESa | 49.5 | 9.1 | 35.7 | 15.2 | 1.5 | 17.5 | 15.4 | 2.0 | 1.1 | .28 |
| DEPb | 43.7 | 13.3 | 41.8 | 12.0 | .1 | 29.3 | 11.6 | .9 | 3.3 | .01 |
| Invalidation | 7.0 | 1.4 | 6.5 | 1.1 | .4 | 3.6 | 1.7 | 2.0 | 3.7 | .01 |
| Strength | 5.2 | 1.7 | 5.2 | 1.6 | .0 | 7.1 | 1.6 | 1.1 | 3.2 | .01 |
a IES = Impact of Event Scale
b DEP = Depression subscale of the revised Symptom Checklist-90