Twin Study Reveals Complex Link Between Teen Screen Time and Mental Health, Downplaying Direct Causation
A long-running Swedish twin study, initiated in 2004, suggests that while teenagers who spend more time on screens report increased symptoms of depression and anxiety, shared genes and family life significantly explain this correlation. The study tracked over 21,000 twins from age nine into their twenties, with parents reporting screen use at age nine and twins self-reporting at ages 15, 18, and 24. National health records were then used to identify diagnoses of depression or anxiety and antidepressant prescriptions up to age 28. Initially, a strong link was observed between interactive screen use (gaming, chatting, browsing) and mental health symptoms, with teens spending over six hours daily on interactive use at 15 being three times more likely to be diagnosed with depression or anxiety by 28. However, when comparing twins within the same family, especially identical twins, this link substantially weakened, indicating that shared genetic and environmental factors play a crucial role in both screen time ...
