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 effectively study things at scale. This is 250 participants tracked over 5 years. That alone is hard enough, so I can appreciate wanting a much larger group.
In the end, I think that you're agreeing with the study - parents involvement and parenting matter.
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 effectively study things at scale. This is 250 participants tracked over 5 years. That alone is hard enough, so I can appreciate wanting a much larger group.
In the end, I think that you're agreeing with the study - parents involvement and parenting matter.