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A recent study on hearing loss and teens by Harvard Medical School-affiliated Brigham and Women's Hospital in Boston revealed a sobering statistic. The study found that the number of U.S. teenagers with hearing loss increased about 30 percent from 1988 to 2006. That means one in five of today's teens already has lost some hearing.While there is no hard evidence to prove it, many experts believe that this hearing loss is related to the increased use of portable MP3 players. Hours spent listening to music set at a high volume can damage hearing. One study of about 200 New York college students found that more than half listened to music at a volume of 85 decibels or louder.