By Kate Kelland LONDON (Reuters) - Teenagers who spend an extra hour a day surfing the internet, watching TV or playing computer games risk performing two grades worse in exams than their peers who don't, according to research by British scientists. In a study of more than 800 students aged 14 and 15, researchers from Cambridge University also found that physical activity had no effect on academic performance. Since this was a prospective study, in which the researchers followed the pupils over time to see how different behaviours affected performance, the scientists said it was reasonable to conclude that too much screen time reduced academic achievement.
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