Acceptance and Commitment Therapy Focused on Repetitive Negative Thinking for Child Depression: A Randomized Multiple‑Baseline Evaluation

Multiple baseline design with nine children (8–13 years) with depression. A 3-session RNT-focused ACT protocol produced reductions in psychological inflexibility and RNT; at 4 weeks there was no depression diagnosis in participants. Very large effect sizes on process and symptom measures, suggesting preliminary efficacy in child populations.