ADHD or just immature?

http://www.eurekalert.org/pub_releases/2016-03/ehs-aoj030716.php

Public Release: 10-Mar-2016
ADHD or just immature?
Elsevier Health Sciences

Attention-deficit hyperactivity disorder (ADHD) is typically diagnosed in childhood and manifests as an inability to sustain attention and control activity levels and impulse control. Some reports have indicated a prevalence of up to 15% in Western countries. Although the causes of ADHD are still unknown, a new study scheduled for publication in The Journal of Pediatrics found that a child's age at school entry may have an effect on the diagnosis of ADHD.

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When looking at the database as a whole, children born in August were more likely to be diagnosed with ADHD and/or receive ADHD medication than those born in September. When broken down and analyzed according to age, only preschool or elementary school-aged children born in August had an increased risk of being diagnosed with ADHD and receiving ADHD medication. However, adolescents born in August did not have an increased risk of ADHD diagnosis. This may imply that increasing age and maturity lessens the impact of birth month on ADHD diagnoses.

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According to Dr. Chen, "Our findings emphasize the importance of considering the age of a child within a grade when diagnosing ADHD and prescribing medication to treat ADHD."