Trends in the incidence of attention deficit hyperactivity disorder in children and early risk factors.

The Cochran‐Armitage test for trend rejects the null of no trend in favor of an increasing trend by birth cohort for 10–11 years old boys and for 10–12 years old girls in the primary care register, and for 5‐ and 7 to 12‐ year‐old boys and for 7‐ to 11‐year‐old girls in the secondary care register, please see Supporting Information S1 : Table S4–S7.

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