Working with a team led by Stephen Intille from North­eastern Uni­ver­sity that develops mobile phone health tech­nology, the USC inves­ti­ga­tors sent 120 chil­dren 20 elec­tronic sur­veys over a four-​​day period that included two week­days and two weekend days. The sur­veys were sent ran­domly over phones sup­plied by the team whose only fea­ture was to prompt the young­sters and accept answers to the survey, Liao said. Seden­tary behavior was divided into pro­duc­tive (home­work, reading) or leisure-​​oriented  activity (playing video games, watching TV).


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