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Adolescents often report low moderate-to-vigorous physical activity (MVPA) and high screen time. We modeled sex-specific MVPA and screen time trajectories during adolescence and identified contemporaneous patterns of evolution. Data were drawn from two longitudinal investigations. NDIT included 1294 adolescents recruited at age 12-13 who completed questionnaires every 3 months for 5 years. MATCH included 937 participants recruited at age 9-12 who completed questionnaires every 4 months for 7 years. MVPA was measured as the number of day