Fig. 2From: A video-based transdiagnostic REBT universal prevention program for internalizing problems in adolescents: study protocol of a cluster randomized controlled trialOverview of enrollment, intervention and assessment measures. *t1x, t2x and *t3x represent the program duration (3 weeks). Note. T1 = Baseline/pre-intervention, T2 = post-intervention, T3 = 3 months follow-up, T4 = 12 months follow-upBack to article page