The Efficacy and Effectiveness of Online CBT - Jeroen Ruwaard

50 Chapter 3. Online CBT of DepressionTable 3.2: Web-CBT vs. waiting-list control (intention-to-treat analysis).Measure a Pre Post c Effect Size ANCOVA cgroup b M SD M SD d CI .95 F 1,51 p dBDI-IAWeb CBT 19.7 5.5 9.8 6.5 .7 ±.6 7.6 .012Control 21.3 5.3 15.6 7.6SCL-90-R Depr.Web CBT 39.9 8.6 26.7 8.1 1.1 ±.7 10.9 .011Control 38.1 7.5 34.4 10.5DASS DepressionWeb CBT 20.6 8.4 7.6 6.9 .5 ±.6 3.4 .070Control 20.8 8.1 11.8 9.8DASS AnxietyWeb CBT 6.9 4.7 2.8 2.8 1.0 ±.6 8.0 .013Control 6.1 4.2 6.3 6.6DASS StressTreatment 18.1 8.6 9.2 7.1 .8 ±.7 4.1 .057Control 15.5 7.9 13.3 8.8W-BQ12Web CBT 14.6 2.6 19.9 4.4 1.0 ±.6 8.6 .015Control 15.3 3.0 16.8 4.7a BDI-IA: Beck Depression Inventory; SCL-90-R DEP: Symptom Check List-Revised Depression scale; DASS: Depression AnxietyStress Scales; W-BQ12: Well-Being Questionnaire. Higher scores indicate less favourable conditions, except for W-BQ12, wherehigher scores indicate higher levels of functioning.b Web-CBT: n = 36; Waiting-list control: n = 18.c Pretest scores of drop-outs (n = 5) were carried forward to the posttest.d ANCOVA: Analysis of Covarianced Listed P-values are adjusted for multiple testing.