[xlii]

I'm completely out of the water, but one thing that I'm not seeing is control for ADHD which is highly heritable (depending on study there are various numbers ranging between 60-90%).

I wouldn't be surprised that ADHD parents would give their ADHD children access to screen earlier (as screens are hypnotic and thus have some calming effect, so, eh, life's experience?).

I'd probably change HN title: study says it's associated, but title suggest there's causation.