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.

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red-iron-pine 3 hours ago | parent [-]

> 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

	▲	munksbeer 3 hours ago \| parent [-]
		And then grandstand on hn about how they give their children zero screen time, as is only right.