In the United States, according to the 2005 YRBS (Youth Risk Behavior Survey), 35.8% of high school students had been physically active for one hour per day on more than five out of 7 days preceding the survey. Nationwide, 9.6% of high school students had not participated in any kind of moderate or vigorous physical activities during the seven days preceding the survey. Twenty-one percent of students engaged for three or more hours per day on an average school day in playing video or computer games and 37.2% of the students watched television for three or more hours per day on an average school day. At total of 54% of the students participated in physical education classes on one or more day in an average week when they were in school, and 33% of students participated in physical education classes for five days in an average week when they were in school. Among the 54.2% of the students who participated in physical education classes, 84% actually exercised or played sports for more than 20 minutes during an average class. Overall 56% of the students had played on one or more sports team (run by school or community groups) during the 12 months preceding the survey. Among the 78.8% of the students who exercised or played sports during the 30 days preceding the survey, 22.2% had had to seek medical attention for an injury related to their participation in exercise or sports.
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