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Percentage of boys (A) and girls (B) in each cohort with mental health problems at age 7 years (defined as scoring within the abnormal range, ≥17 of the Strengths and Difficulties Questionnaire). 1965 (National Child Development Study); 1998 (Avon Longitudinal Study of Parents and Children); 2008 (Millennium Cohort Study). Error bars indicate 95% confidence intervals
