Within-group and between-group effect sizes with 95% confidence intervals for the PSWQ, PHQ-9, WHODAS, and the SWLS from pre-treatment to 6-month follow-up.
IUT
Abbreviations: PSWQ: Penn State Worry Questionnaire; PHQ-9: Patient Health Questionnaire 9; WHODAS: World Health Organization Disability Assessment Schedule 2.0; SWLS: Satisfaction with Life Scale; IUT: intolerance-of-uncertainty therapy; MCT: metacognitive therapy; d = model-based Cohen’s d effect sizeBetween post-treatment and the 6-month follow-up, worry scores remained stable in the IUT group (F(57.81) = 0.01, p = .980) and the MCT group (F(46.39) = 1.18, p = .283) (At post-treatment, 71.9% of the participants in the IUT group and 96.3% in the MCT group met the criteria for reliable improvement (≥7 point decrease in PSWQ score). One participant in the IUT group and none in the MCT group met the criteria for reliable deterioration (≥7 point increase in PSWQ score). At the 6-month follow-up, 67.9% of the participants in the IUT group and 82.6% in the MCT group met the criteria for reliable improvement. At follow-up, one participant in each group met the criteria for reliable deterioration. Significantly more participants in the MCT group than in the IUT group met the criteria for reliable improvement at post-treatment (χRegardless of whether we used a PSWQ cut-off score of 47 points, as in the Nordahl study [