This study is useless as it leaves out the most important metric: how much did kids use phones. Being children in low-income latin families does suggest they ca

This study is useless as it leaves out the most important metric: how much did kids use phones. Being children in low-income latin families does suggest they can't afford to consume much online content as compared to kids from even middle-class families. Its as stupid as the famously flawed "Danish Cohort" cellphone/cancer study that used subscription duration as a surrogate for actual phone use. And at a time when phones and talk-time was very expensive.