The data used in this research was part of a collaborative cross-national study of health behaviours in school-aged children (HBSC) in sixth, eighth and tenth grade.
Gögn þessarar rannsóknar eru hluti af alþjóðlegri mælingu á heilsu og lífskjörum skólabarna (e. Health and behaviour of school-aged children (HBSC)) í sjötta, áttunda og tíunda bekk.