A total of 3618 adolescents participated in the study, of which 47,8% were boys and 49,3% girls, 2,9% chose not to report their gender.
Þátttakendur voru alls 3618 nemendur, þar af voru 47,8% drengir og 49,3% stúlkur 2,9% kusu að gefa ekki upp kyn sitt.