A total of 3.545 16-20-year-old students, 52% of which female, from every upper secondary school in Iceland participated in this study.
Þátttakendur í þessari rannsókn voru 3.545 nemendur úr öllum framhaldsskólum landsins. Þeir voru á aldrinum 16 til 20 ára, þar af 52% stúlkur.