Baseline prevalence of health and behavioural problems and lifestyle
| Total | Boys | Girls | ||||
|---|---|---|---|---|---|---|
| N | Per cent | N | Per cent | N | Per cent | |
| Mental health variables | ||||||
| Anxiety/depressive symptoms | 397 | 16.5 | 128 | 11.5 | 269 | 21.0 |
| Attention problems | 448 | 18.7 | 188 | 16.9 | 260 | 20.2 |
| Conduct problems | 249 | 10.4 | 181 | 16.2 | 68 | 5.3 |
| Insomnia (DIS) | 185 | 7.7 | 67 | 6.0 | 118 | 9.2 |
| Physical health variables | ||||||
| Pain and tension problems | 453 | 18.9 | 148 | 13.3 | 305 | 23.8 |
| Underweight* (total N=2210) | 149 | 6.2 | 60 | 5.4 | 89 | 6.9 |
| Overweight* (total N=2210) | 303 | 12.6 | 138 | 12.4 | 165 | 12.9 |
| Obesity (total N=2210) | 64 | 2.7 | 35 | 3.1 | 29 | 2.3 |
| Lifestyle factors | ||||||
| Early alcohol intoxication(s) | 624 | 26.0 | 267 | 23.9 | 357 | 27.8 |
| Physical activity (4 days/week or more) | 697 | 29.1 | 397 | 35.6 | 300 | 23.4 |
| Daily or occasional smoking | 248 | 10.3 | 87 | 7.8 | 161 | 12.1 |
DIS, difficulties initiating sleep.
Total N=2399, N completers suicidal thoughts=2271, N physical examination=2210.
*Overweight and underweight are defined by international (IOTF) criteria based on BMI cut-off in each year and gender cohort.