The study was a mixed-methods, multicenter, pragmatic randomized controlled trial (RCT) that compared PPEP4All-PDD to CAU in patients with PDD. The pragmatic randomized controlled trial was selected to investigate PPEP4All-PDD in a way that mimics the real-world experience of the participating mental health clinics (e.g., the intervention was provided by trained mental health professionals of the clinic and inclusion criteria reflected the usual patient with PDD in the clinic).
