Table 6.
Quantitative synthesis of controlled psychotherapy studies sorted by risk of bias assessment
| RoB | Primary endpoint | CBT | Baseline vs. end of treatment | Baseline vs. 6-months FU | |||
| d [95% CI] | d [95% CI] | ||||||
| GSH | WLC | CBT | GSH | ||||
| Müller, Mueller, et al. (2008) | 47 | CBS | 0.68 [0.17, 1.19]a | 0.20 [−0.32, 0.72]a | 1.39 [0.78, 1.99]b | ||
| YBOCS-SV | −0.86 [−1.38, −0.34]a | −0.34 [−0.86, 0.17]a | −1.05 [−1.63, −0.47]b | ||||
| Müller et al. (2013) | 38 | CBS | 1.44 [0.78, 2.11]a | 0.66 [0.02, 1.30]a | 0.37 [−0.38, 1.12]a | 2.47 [1.58, 3.37]b | 2.56 [1.61, 3.51]b |
| YBOCS-SV | −1.06 [−1.69, −0.43]a | −1.17 [−1.84, −0.50]a | −0.54 [−1.30, 0.21]a | −1.60 [−2.38, −0.82]b | −1.78 [−2.62, −0.93]b | ||
| Mitchell et al. (2006) | 23 | CBS | 1.06 [0.50, 1.62]a | 0.65 [−0.42, 1.72]b | 1.94 [1.91, 2.63]b | ||
| YBOCS-SV | −2.20 [−2.87, −1.54]a | −0.04 [−1.08, 1.01]b | −3.69 [−4.66, −2.72]b | ||||
Note. RoB = risk of bias based on CONSORT criteria (higher scores indicate lower risk of bias), CBS = Compulsive Buying Scale, YBOCS-SV = Yale-Brown Obsessive-Compulsive Scale, FU = follow-up, CBT = cognitive behavioral therapy, GSH = guided self-help, WLC = waiting list control.
Cohen's d and 95% confidence intervals (CI) are reported. Positive dCBS and negative dYBOCS-SV indicate improvement. abased on published intention-to-treat analysis, bbased on published completer analysis. The findings of the controlled psychotherapy study by Benson et al. (2014) are not included in the quantitative synthesis because YBOCS-SV means and SDs were not provided by group.