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Yeah, I admit I didn't click through and read the methods so it's possible they did what was necessary, but off the top of my head, you would need to do your best to model:

1. Parents' own socioeconomic status

2. Parents' educational attainment

3. Parents' working memory (since this is one of the measures, and it's somewhat heritable)

Not easy at all.

> 1. Parents' own socioeconomic status

broke tired people who need time to do basic tasks at home end up putting their kids in front of screens -- news at 11

meanwhile bourgeoisie programmer types working at home take kiddo for a walk to the park and then hand them off to the after school programs or Filipina nanny

And then grandstand on hn about how they give their children zero screen time, as is only right.

Yea I’d love to see what they attempted to control for. I can’t imagine it’s possible to begin to draw a causal link.

Smoking crack could be correlated with not eating a healthy died