[irjustin]

The situation you describe is rightfully terrible, but the conclusion you seem to be pointing at is, no one should have a phone until they're 18? or similar?

I don't think that's what you actually mean to say, so when we're talking about larger the group, this specific situation won't lead you to the same conclusion.

> Sleep quality and depression are no where near my concerns.

There aren't many ways to study things at scale. This is 250 participants tracked over 5 years. That alone is hard enough.

In the end, I think that you're agreeing with the study - parents involvement and parenting matter.