Screen time tracking across electronic devices in school-aged adolescents: a three-year longitudinal study

This is the authors' abstract. We don't add key points for this paper.

The aim of this article is to verify the tracking of screen time (ST) on different electronic devices in school-aged adolescent during a three-year follow-up. This is a three-year longitudinal study involving students. The baseline data collection occurred in 2016, and the follow-up in 2019. A total of 151 adolescents of both sexes aged 14.9 (0.9) years participated. ST was analyzed by self-reported questions about time spent watching television (TV); video games (VG); smartphone; TV, smartphone, tablet (TST) and personal computer (PC). For analysis purposes, each device was ranked below and above the ST recommendation (2h/day). For both sexes, tracking was low for all screens, except for weak agreement in TV time for girls. For boys, TST and smartphone were the screens with the highest change percentages for subjects who migrated to high ST, respectively, 68.6% and 34.4% (p < 0.05). For girls, the same occurred for smartphones and 67.1% for TST (p < 0.05). The TST and smartphone devices were the devices that changed the most over the course.