A study of Attention Deficit Disorder among Finnish children reinforces the idea that children outgrow some of their symptoms, but also raised some questions about the long-term effectiveness of medications as a treatment for the condition.
Dr. Susan Smalley, of the University of California/Los Angeles, used data from a longitudinal Finnish study begun in 1986. Researchers from Finland's University of Oulu and Imperial College in London collected information on 9,432 children from the time of their mothers' pregnancies until adolescence. About 457 of the children were evaluated for ADHD and other psychiatric disorders.
Dr. Smalley found that symptoms of hyperactivity and impulsivity decreased as the children grew older, but symptoms of inattention continued into adolescence. Only about half the adolescents diagnosed with ADHD had cognitive deficits in working memory, inhibition, etc that are commonly associated with ADHD. Those with cognitive defects did not show increased levels of inattention or hyperactivity compared to others with ADHD.
Youth in Finland rarely take medications for ADHD. Dr. Smalley found that when she compared children with ADHD in Finland who did not take drugs to those in the United States who did, she could conclude that prevalence, symptoms, psychiatric comorbidity and cognition was equivalent for both groups.
"We know medication is very effective in the short-term, but the study raises important questions concerning the efficacy of ADHD treatment," she said.
Two genes labeled DBH and DRD2 that regulate dopamine were associated with ADHD in the Finnish population of adolescents.
This study appears in the Journal of the American Academy of Child and Adolescent Psychiatry.
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