2.5. Research Process
ADHD
After randomization and before the start of the intervention, 68 families in the intervention group did not participate in any sessions due to closures caused by the epidemic and parental time coordination difficulties, and 17 families in the control group dropped out of the program due to the epidemic after baseline assessment. Seven families in the intervention missed more than three sessions. A series of measures were taken to better motivate parents to participate in the sessions, including establishing group contacts to keep in touch with parents and help answer their questions, providing timely reinforcement during the sessions for parents who attended and completed assignments on time, and encouraging them to communicate with other family members about the intervention content after the sessions to gain family support. In addition, encouraging both parents to participate in the sessions also largely avoided the problem of absenteeism due to one of the parents being absent due to a temporary commitment, with 90% of the families ultimately missing at most one session or fully participating in all eight sessions. Families enlisted in the control cohort were not engaged in the programmatic intervention. However, they were furnished with fundamental psychoeducational resources pertinent to ADHD, as deemed necessary. At postintervention follow-up, two families in the intervention group did not participate in the follow-up assessment due to postpromotion class schedule conflicts, and one family dropped out of the follow-up assessment because of to a closure due to the epidemic. One family in the control group withdrew from the follow-up assessment. 