Based on a study published in the Journal of Pediatrics, of the 32,394 kids produced in August (the youngest kids), 2.9 percent were diagnosed with ADHD. The lowest was September (the earliest kids), with 1.8 percent of the 33,607 kids diagnosed with ADHD. The complete results can be found in Table 1 of the paper.
Our findings underscore the need for considering the age of a kid in a level when diagnosing ADHD and prescribing drugs for treating ADHD,” the researchers wrote.
Interestingly enough, it was just present in preschool and elementary school kids, and not youth. The uniformity in ADHD in adolescents might mean that raising age (and therefore adulthood) could decrease the effect of arrival month on ADHD.