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Hyperactivity: Increased prevalence of children with ADHD and the use of stimulants
Date:3/5/2012

This release is available in French.

A new study from the Universit de Montral shows an increase in prevalence of Canadian children diagnosed with attention-deficit hyperactivity disorder (ADHD) and in the use of medications associated with ADHD in school-age children.

The study, Prevalence of Prescribed Attention-Deficit Hyperactivity Disorder Medications and Diagnosis Among Canadian Preschoolers and School-Age Children: 1994-2007, was conducted by the doctoral student in sociology, Marie-Christine Brault, under the supervision of Professor ric Lacourse of the Research Unit on Children's Psychosocial Maladjustment (GRIP) at the Universit de Montral. It was published in the most recent issue of the Canadian Journal of Psychiatry.

Increased use of medications

In 2000, 43% of Canadian children with ADHD were taking medications, while in 2007, the number was 59%. The study's data comes from a sample of Canadian children aged 3 to 9 who participated in the National Longitudinal Survey on Children and Youth.

"The increased use of medications by children with ADHD in Canada is a reflection of the global trend, says Marie-Christine Brault, lead author of the study. Consumption of drugs like Ritalin, to name but one, has more than doubled since 1994, when it was 1.3%."

The study also showed a decrease in the off-label use of ADHD medications, except for preschoolers, for whom there was a slight increase. "Some doctors may be prescribing ADHD medications to treat other problems such as oppositional defiant disorder or conduct disorder. This may explain the slight increase," says Marie-Christine Brault.

Boys take more medications

According to the results of the study, boys' prevalence of medication use, at around 3%, was higher than that of girls; however, girls showed the steepest increase over time, up to 2.1-fold. This rise occurred essentially in the 1990s, while for boys, it was observed in the 2000s.

Increased use of medications among school-age children

Preschoolers' prevalence of both ADHD diagnosis and prescribed medications stayed stable between 1994 and 2007 (1% or less), while that of school-age children increased nearly two-fold, suggesting, for the authors, that school environment plays a role in the increased use of medications.

"Can the upward trend in ADHD diagnoses explain the increased use of medications? Or is the opposite true?" asks Marie-Christine Brault. "Both hypotheses are plausible. Identifying the factors associated with these trends is the only way to answer the question: Are children with ADHD over-medicated?"

The question is not banal, because attention-deficit hyperactivity disorder is the most common mental illness in children.


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Contact: Julie Gazaille
j.cordeau-gazaille@umontreal.ca
514-343-6796
University of Montreal
Source:Eurekalert

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