nejm.org/doi/full/10.10…
Thread
About 1 in 4 kids who are born in Aug wouldn’t have been diagnosed w/ & treated for ADHD had they been born in Sept
Why?
In states w/ Sept 1 cutoff, Aug-born kids are youngest in class, Sept-born oldest.
Inattentive behavior in Aug kids interpreted as ADHD vs immaturity
No Aug vs Sept effect in states without a Sept 1 cutoff
No effect for diabetes, asthma, and obesity, conditions all diagnosed by more objective criteria (ie not influenced by peer to peer comparisons made in classrooms)
Largest effect in boys
This idea isn’t new. It’s been shown in the US using data from 10 years ago and in other countries. But despite this, as of 2015 these large differences still persist.
Question is whether Aug kids are over or underdiagnosed? Our data can’t definitely answer that question