El 7,8% de los niños estadounidenses de 4 a 17 años de edad fueron diagnosticados de trastorno de hiperactividad y déficit de atención en el año 2003, y más de la mitad reciben tratamiento farmacológico, según datos presentados por los CDC de Atlanta.
Los investigadores indican que los chicos tienen 2,5 veces más probabilidades de presentar este trastorno que las chicas, especialmente los varones de familias pobres. La prevalencia del trastorno aumenta con la edad, añaden, de modo que es significativamente más baja entre los niños de 4 a 8 años en comparación con los mayores de 9.
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