Researchers at the University of Pittsburgh School of Medicine contacted 106 adolescents up to 60 times via cellphone over 5 weeks to ask about their media use at the time of the call. Forty-six teens had already been diagnosed with Major Depressive Disorder. Of the five media activities (television or movies, music, video games, Internet, and print media, such as magazines, newspapers, and books), only listening to music and reading were correlated with depression. In other words, the depressed teens were significantly more likely to be listening to music and less likely to be reading print media than the non-depressed teens. The researchers properly conclude that the association does not prove causality.