survey, on, compare, both, find, opposite, to, low, necessary, whether, increase, high

At present, quite a few teens spend much time with their iPods listening to music, but a new study suggests that teens who spend too much time listening to music may be at       risk of depression (抑郁症).
The study, led by Brian, an assistant professor at the University of Pittsburgh School of Medicine,
      that teens who listened to music more often had 80% higher risk of depression,        with teens who listened to music less often.
According to the study, teens who most often listened to music could listen for at least four        five hours a day.
“At this point, it’s not clear        depressed people begin to listen to more music to escape, or whether listening to large amounts of music can lead to depression, or       ,” said Brian in a statement. However, researchers found that reading books had the       result: with increase in time spent reading, teens’ risk of depression dropped 50%.
For the study, the researchers       106 teens of 7 to 17 for two months. According to the survey, music showed strong associations (联系) with       depression risk. But that doesn’t       mean that music causes depression — for some depressed teens, music may even help.

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