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Researchers from Mayo Clinic in Rochester have found that children with ADHD (attention deficit hyperactivity disorder) have a higher chance of having WLD (written language disorder). They gathered information from school, private tutorial and medical records. They calculated cumulative incidences of WLD, hazard ratios (HRs) and with or without RD. Girls with ADHD are at higher risk of having WLD with RD compared with boys with ADHD, whereas boys and girls are at the same risk of having WLD without RD.