The total number of participants was 10.717 adolescents between the ages of 14-21 but a sample of 5.630 adolescents between the ages of 14-17 was used in this research.
Alls tóku 10.717 ungmenni á aldrinum 14-21 þátt, en úrtak með 5.630 unglingum á aldrinum 14-17 var greint frá í þessari rannsókn.