Table 1.
Descriptive characteristics of the study population (N=13 964) at baseline, 2000–2004, and at follow-up, 2010
| At baseline | N | Per cent |
|---|---|---|
| Gender | ||
| Girls | 7019 | 50.3 |
| Boys | 6945 | 49.7 |
| Sociodemographic characteristics | ||
| Ethnicity | ||
| Ethnic Norwegian | 12155 | 87.0 |
| First-generation immigrant | 1126 | 8.1 |
| Second-generation immigrant | 683 | 4.9 |
| Parents’ educational level | ||
| College or university degree >4 years | 1937 | 13.9 |
| College or university degree ≤4 years | 4277 | 30.6 |
| High school | 5681 | 40.7 |
| Primary school | 1864 | 13.3 |
| Missing | 205 | 1.5 |
| Parents’ marital status | ||
| Married or living together | 9255 | 66.3 |
| Other | 4600 | 32.9 |
| Missing | 109 | 0.8 |
| Household income | ||
| Very good or good | 8732 | 62.5 |
| Mediocre | 4546 | 32.6 |
| Poor | 457 | 3.3 |
| Missing | 229 | 1.6 |
| Status at follow-up | ||
| High school dropout | ||
| Total | 4040 | 28.9 |
| Girls | 1668 | 23.8 |
| Boys | 2372 | 34.2 |