This research was based on data from 2013/2014, with 3.431 participants including 1,696 adolescent female and 1,735 male.
Notast var við svör ungmenna úr 10. bekk frá árunum 2013/2014, en þátttakendur voru samtals 3.431; þar af voru stúlkur 1.696 talsins, og strákar 1.735.