2.2. Intervention Quality Control
In December 2018, we trained a total of 15 interventionists, including therapists and doctors involved in the intervention, both online and offline, averaging three interventionists per center. The training was conducted under the guidance of a senior child psychiatry specialist and two clinical psychology experts, including online lectures, offline seminars, and supervision meetings. The offline training included 12 hours of face-to-face lectures and role-plays, covering the theoretical background, operation manuals, and case examples of parent behavior management training. Online training included eight hours of video seminars and Q&A sessions. From December 2018 to December 2020, one offline training and three online supervisions were completed. Therapists and doctors were eligible for intervention only after completing the offline training. Each supervision meeting required at least two interventionists from each center to participate. The ratio of online to face-to-face training was similar across the five centers, ranging from 70% to 80% for face-to-face training, and from 50% to 70% for online training. Throughout the intervention period, individual guidance and real-time Q&A were provided via working groups to ensure the accuracy of the intervention, ensuring the accuracy and consistency of the intervention implementation.