Ok, but how about student grades? I wouldn't have expected any impact on mental health resulting from a school ban considering the exposure they get every other hour of the day.
school phone bans in brazil appear to increase test scores by 0.06 SD (although the identification strategy is a bit sketchy): https://www.nber.org/system/files/working_papers/w35233/w352...
Study: Schoolwide phone bans show no significant impact on road death toll.
iirc a similar study on the Aussie age ban is finding similar results; basically no difference. Some kids benefit, others suffer.
Agree that a study on grades would be useful too
That's like saying not eating for a few hours makes up for eating 4000 calories at dinner.
I personally would've guessed many immediate positive effects just from a phone ban in school, TFA claims they have a measurement against that.
And ofc AI is busy messing all of this up.
AFAIK declining mental health was the main driver of the bans - put forward by its proponents like Jonathan Haidt, author of "The Anxious Generation."