Table 1.

Sample characteristics

	N	%
Total	1887	100
Males	924	48.97
Females	963	51.03
From municipalities with:
< 50 000 people	1,188	62.96
50 000–250 000 people	415	21.99
>250 000 people	284	15.05
School grade:a
2	256	13.57
3	243	12.88
4	252	13.35
5	271	14.36
6	325	17.22
7	303	16.06
8	237	12.56

^aThe proportion of males within the grades ranged from 46.81 to 54.38%.