The study will compare the impact FIRST (a transdiagnostic treatment built upon five empirically supported principles of change) versus usual care outpatient psychotherapy on youths' mental health outcomes and a candidate mechanism of change: regulation of negative emotions.
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Child Behavior Checklist (CBCL; Achenbach & Rescorla, 2001) and Youth Self-Report (YSR; Achenbach & Rescorla, 2001)
Timeframe: Change from baseline to 18 months (quarterly at 0, 3, 6, 9, 12, and 18 months from 0 up to 78 weeks)
Behavior and Feelings Survey (BFS; Weisz et al., 2020)
Timeframe: Change from baseline through end of treatment (weekly from 0 up to 78 weeks)
Functional Top Problems Assessment (TPA; Weisz et al., 2011)
Timeframe: Change from baseline through end of treatment (weekly from 0 up to 78 weeks)