1.1 General information of samples sample of 145 people are a group of people control the number of trials, 76 69 people most similar in terms of age group, for example, the majority of parents are father and mother's occupations, the most common hire, travel-motorbike/car seat is nested private or hire cars, aiding in most homes, also is common, such as exercise, running, biking, playing most of the workout with the most friends, Monday-Friday.
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