The joint report by DQ Institute and the World Economic Forum noted that over 50 per cent of the age bracket was susceptible to cyber-bullying, video game addiction, offline meetings, disinformation and online sexual grooming.
Notably, the problem is more acute in emerging economies, where "internet adoption has been more rapid and less subject to appropriate safeguards by parents, industry or government".
The study of 38,000 children noted that 47 per cent have been victimised through cyber-bullying in the past year.
Moreover, the children spend an average of 32 hours per week in front of digital screens for entertainment alone
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longer than the time they spend in school, the study said.
There is a positive association between screen time and exposure to cyber-bullying, video game addiction, offline meetings and online sexual behaviours, it said.
The purpose of the '2018 DQ Impact Report' is to highlight the need for concerted action by government, industry and civil society to help parents counter the threats facing the youngest 'digital citizens' and such a need is more acute in emerging economies.