Table 1 Descriptive statistics of the background variables
2002 | 2017 | |||||
|---|---|---|---|---|---|---|
N | % | OWOB %a | N | % | OWOB %a | |
Sex | 1675 | 823 | 1580 | 814 | ||
Girl | 823 | 49.1 | 9.0 | 814 | 51.5 | 14.0 |
Boy | 852 | 50.9 | 17.0 | 766 | 48.5 | 20.0 |
Age, years (mean) SD | 1675 | (15.9) 0.3 | 1580 | (15.8) 0.4 | ||
Sociodemography of the family | ||||||
Not living with siblings | 1631 | 17.0 | 14.4 | 1566 | 16.5 | 22.1 |
Poor family economy | 1656 | 3.5 | 24.1 | 1572 | 4.0 | 23.8 |
Parents not living together | 1664 | 27.1 | 13.1 | 1573 | 32.1 | 20.0 |
Father working full time | 1644 | 84.2 | 12.2 | 1560 | 84.5 | 16.4 |
Mother working full time | 1654 | 57.8 | 11.9 | 1569 | 70.2 | 16.0 |
Teeth brushing ≤ once daily | 1670 | 25.7 | 18.4 | 1573 | 24.1 | 24.0 |
Rural living | 1675 | 74.1 | 13.0 | 1580 | 72.3 | 18.7 |
Smoking | ||||||
Never smoked | 1671 | 62.4 | 13.2 | 1567 | 87.0 | 16.3 |
Parental smoking | 1675 | 35.8 | 14.0 | 1580 | 12.4 | 23.0 |
Mental health issues | ||||||
Sought help for mental health issuesb | 1573 | 5.2 | 14.6 | 1541 | 13.0 | 21.9 |
Activity | ||||||
Spare-time physical activity < 4 times weeklyc | 1570 | 56.9 | 14.3 | 1576 | 55.9 | 19.3 |
Screen time > 2 h/daily | 1666 | 57.6 | 14.8 | 1571 | 68.7 | 17.6 |
Participates in organized spare-time sports | 1659 | 43.5 | 9.3 | 1563 | 56.8 | 12.2 |
Walking or riding bike to school | 1665 | 35.6 | 11.6 | 1577 | 39.9 | 14.6 |
Student education | ||||||
Educational plans > 12 years | 1659 | 46.6 | 11.7 | 1573 | 61.0 | 13.0 |
Best or second-best gradesd | 1555 | 55.3 | 11.2 | 1506 | 67.8 | 14.7 |
Positive opinion on educatione | 1642 | 68.9 | 11.9 | 1565 | 78.9 | 16.2 |
Nutrition | ||||||
Daily breakfast | 1673 | 65.8 | 13.9 | 1576 | 62.9 | 15.3 |
Drinking sugar-containing soda ≥ daily | 1664 | 37.5 | 14.4 | 1561 | 13.4 | 16.3 |
Eating candy ≥ daily | 1660 | 17.7 | 9.9 | 1566 | 8.2 | 14.8 |