Outcome variable | 2007 | 2012 | 2018 | Differencea | p-for trendb |
---|---|---|---|---|---|
 | % | % | % |  |  |
Body weight and dietary behaviour | |||||
 Overweight/obesity | 12.4 | 21.0 | 25.9 | +13.5 | <0.001 |
 Obesity | 1.9 | 3.4 | 5.2 | +3.3 | <0.001 |
 Fruits <2 times/day | 65.4 | 59.1 | 78.6 | +13.2 | <0.001 |
 Vegetable <3 times/day | 90.8 | 86.4 | 89.2 | -1.6 | 0.427 |
 Went hungry (mostly/always) | 1.8 | 3.1 | 1.7 | -0.1 | 0.483 |
Physical activity and sedentary behaviour | |||||
 Physical inactivity | 92.2 | 87.8 | 87.1 | -5.1 | <0.001 |
 Leisure-time sedentary behaviour | 51.0 | 52.8 | 57.7 | +6.7 | 0.036 |
 0 days walk or bike to school | 26.2 | 32.1 | 34.0 | +7.8 | 0.046 |
Substance use | |||||
 Parental tobacco use | 38.6 | 35.8 | 35.2 | -3.4 | 0.114 |
 Current cigarette use | 26.9 | 21.3 | 20.6 | -6.3 | 0.005 |
 Current other tobacco use | 4.3 | 5.8 | 8.0 | +3.7 | 0.006 |
 Passive smoking | 78.5 | 76.7 | 68.4 | -9.9 | <0.001 |
 Current alcohol use | 53.2 | 51.3 | 55.7 | +2.5 | 0.290 |
 Lifetime drunk | 31.2 | 29.5 | 38.8 | +7.6 | <0.001 |
 Trouble from alcohol use | 20.8 | 21.8 | 13.3 | -8.5 | <0.001 |
Injury and violence | |||||
 Any serious injury | 26.2 | 25.3 | 28.4 | +2.2 | 0.171 |
 Bullied | 23.6 | 23.5 | 34.9 | +11.3 | <0.001 |
 In physical fight | 19.6 | 24.1 | 16.5 | -3.1 | 0.075 |
 Physically attacked | 19.2 | 19.8 | 15.9 | -3.3 | 0.042 |
Poor mental health | |||||
 Having no close friends | 4.0 | 4.7 | 5.3 | +1.3 | 0.043 |
 Loneliness | 12.8 | 13.1 | 23.1 | +10.3 | <0.001 |
 Worry-induced sleep disturbance | 13.7 | 11.9 | 18.0 | +4.3 | <0.001 |
 Suicidal ideation | 19.8 | 22.2 | 28.6 | +8.8 | <0.001 |
 Suicide plan | 15.8 | 19.6 | 22.6 | +6.8 | <0.001 |
Sexual behaviour | |||||
 Ever sex | 24.4 | 35.2 | 36.4 | +12.0 | <0.001 |
 Multiple sexual partners | 13.6 | 14.9 | 16.9 | +3.3 | 0.210 |
 Non-condom use | 7.0 | 7.8 | 8.4 | +1.4 | 0.532 |
Protective factors | |||||
 School attendance | 65.7 | 69.3 | 72.3 | +6.6 | 0.016 |
 Peer support (mostly/always) | 57.8 | 53.8 | 44.5 | -13.3 | <0.001 |
 Parents/guardians supervision (mostly/always) | 37.0 | 28.6 | 26.6 | -10.4 | <0.001 |
 Parents/guardians connectedness (mostly/always) | 54.9 | 49.7 | 40.0 | -14.9 | <0.001 |
 Parents/guardians bonding (mostly/always) | 59.2 | 58.0 | 56.9 | +0.7 | 0.116 |