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REACH (Resilience, Ethnicity, and AdolesCent Mental Health) study design, accelerated cohort study. C1, Cohort 1; C2, Cohort 2; C3, Cohort 3. Dashed lines indicate points where cohorts overlap. C1, C2, and C3 overlap at School Year 8; C2 and C3 overlap at School Year 9; C2 and C3 overlap at School Year 10. *For one participating school, baseline data collection was deferred by a year so data were collected in 2018 (T1), 2019 (T2), 2020 (T3)
