For those who spent 40 or more hours a week using social media, that number approached 24%. By the twelfth grade, however, the negative correlations between screen time and teen psychology had somewhat dissipated. The surveys can't say whether screen time directly changes teens' mental health, the research states. Follow CNN Health on Facebook and Twitter See the latest news and share your comments with CNN Health on Facebook and Twitter. But the latest research "is looking straight at technology and wanting it to be the scapegoat."

Source: CNN January 22, 2018 14:15 UTC