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Average daily Internet time (minutes) on weekdays according to bedtime on weekdays in each survey. A comparison of the duration of internet use (in minutes) on weekdays among the groups as per bedtime, as assessed using ANOVA. A post hoc analysis between the group with bedtime before or at 9:59 PM and groups with bedtime at or after 10:00 PM (10:00–10:59 PM, 11:00–11:59 PM and at or after 12:00 PM) was performed using Dunnett’s test.
