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FM Franziska Miegel
CD Cüneyt Demiralay
SM Steffen Moritz
JW Janina Wirtz
BH Birgit Hottenrott
LJ Lena Jelinek
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To detect a medium to large effect size of d = 0.80, with an alpha level of α = 0.05 and a power of 0.80, G*Power [66] calculated a sample size of N = 70. As a dropout rate of 15% is expected, a sample of N = 80 patients with OCD will be recruited and randomized to the two groups (n = 40 MCT-OCD, n = 40 usual care control group). A diagnosis of OCD will be verified by the Mini International Neuropsychiatric Interview 5th Ed. (MINI 7.0.2) [67], which serves to elucidate further psychiatric diagnoses based on the Diagnostic and Statistical Manual of Mental Disorders (5th ed.) (DSM-5).

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