The goal of this clinical trial is to learn about how psychotherapy works for children and adolescents aged 8 - 15 with anxiety, depression, trauma, or disruptive behaviour. The main question it aims to answer is: • Is the biobehavioural regulation of negative emotion a transdiagnostic mechanism of treatment response in psychotherapy for children with anxiety, depression, trauma and/or disruptive behaviour? Children and their parents will be randomly assigned to an evidence-based, transdiagnostic treatment (the Modular Approach to Therapy for Children with Anxiety, Depression, Trauma, and Conduct Problems; MATCH-ADTC) or a waitlist control condition. Participants in both groups will complete a baseline assessment, weekly measures consisting of brief symptom scales and medication tracking, and quarterly assessments every 3 months. Following the intervention/waitlist period, our team will conduct post-test assessments. All assessments, except for the weekly surveys, will consist of symptom scales, clinical interviews, experimental tasks and physiological measures.
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Change in parent-rated child psychopathology symptoms
Timeframe: Change at quarterly (3 month intervals after pre-test), change at post-test (after completion of the waitlist or intervention treatment; an average range 4 - 6 months)
Change in child self-reported psychopathology symptoms
Timeframe: Change at quarterly (3 month intervals after pre-test), change at post-test (after completion of the waitlist or intervention treatment; an average range 4 - 6 months)
Change in child psychopathology symptoms (past week)
Timeframe: Change at post-test (after completion of the waitlist or intervention treatment; an average range 4 - 6 months)
Change in child emotional-behavioural problems
Timeframe: Change at quarterly (3 month intervals after pre-test), change at post-test (after completion of the waitlist or intervention treatment; an average range 4 - 6 months)
Change in child impairment
Timeframe: Change at post-test (after completion of the waitlist or intervention treatment; an average range 4 - 6 months)
Change in ratings of child emotion regulation
Timeframe: Change at post-test (after completion of the waitlist or intervention treatment; an average range 4 - 6 months)
Change in child physiological emotion regulation (heart rate variability)
Timeframe: Change at quarterly (3 month intervals after pre-test), change at post-test (after completion of the waitlist or intervention treatment; an average range 4 - 6 months)
Change in child physiological emotion regulation (skin conductance)
Timeframe: Change at quarterly (3 month intervals after pre-test), change at post-test (after completion of the waitlist or intervention treatment; an average range 4 - 6 months)