2 ) labeled as “medium difficulties” had a decreasing trend and encompassed 24.5% of boys and 25.3% of girls, respectively.
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Physical activity and psychopathology: are long-term developmental trajectories of physical activity in children and adolescents associated with trajectories of general mental health problems and of attention-deficit hyperactivity (ADHD) symptoms?
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2 ) showed an increasing trend and was therefore named “increasing difficulties”.