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PISA 2015 data reveal: Time spent online increased ...

„PISA 2015 data revealed that, on average across OECD countries, students spent almost two and a half hours online outside of school on a typical weekday, and more than three hours on a typical weekend. Time spent online increased on average by about 40 minutes between 2012 and 2015, both on weekdays and weekends.“

Julie Hooft Graafland, „New technologies and 21st century children“ (2018), S. 9