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Every hour of daily screen time knocks two grades off teenagers’ exam scores, study shows

BMJ 2015; 351 doi: (Published 04 September 2015) Cite this as: BMJ 2015;351:h4764
  1. Nigel Hawkes
  1. 1London

Every hour spent each day by teenagers watching television, browsing the internet, or playing computer games knocks the equivalent of two grades off their performance at GCSE, a study has found.1 It also showed that extra hours of homework had a positive effect on GCSE performance unless they became excessive.

The study, published in the International Journal of Behavioral Nutrition and Physical Activity,1 included 845 children from 18 secondary schools in Cambridgeshire and measured daily activity and sedentary behaviour at an average age of 14.5, comparing this with their GCSE results a year later. All of the points the children scored at GCSE were added up …

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