Online hours and adolescent internet addiction(AIA). (A) The relationship between the online hours per weekend or per weekday and the rates of AIA in 5,122 Shanghai adolescents. Both lines indicated that more hours online on weekdays or weekends were associated with higher rates of AIA. (B) Weekday-pattern of internet-use in 449 adolescent internet addicts. Both lines indicated that more internet addicts overused internet on weekends than on weekdays.
Xu et al. BMC Public Health 2012 12:1106 doi:10.1186/1471-2458-12-1106