The researchers used two surveys conducted among South Korean youths in 2017 and 2020 respectively, asking over 40,000 teenagers how many hours per day they spent on their phones on average. Teens were also asked about mental health, substance use and obesity. As expected, they found screen time increased significantly between 2017 and 2020, from 30% reporting screen times of over 4 hours per day in 2017, to over 55% in 2020. They also found that all three categories tested negative mental health outcomes, substance abuse, and obesity increased the more time children spent on their phones.
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