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Anupam Jena @AnupamBJena
, 4 tweets, 2 min read Read on Twitter
Take 2 kids. One born in Aug & the other in Sept. In states with a Sept 1 cutoff for school entry, Aug-born kids are 35% more likely to be diagnosed AND medically treated for ADHD. Our study w/ @timothyjlayton @ml_barnett @tannerhicks42 in @NEJM

nejm.org/doi/full/10.10…

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2/
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
3/
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
4/

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
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