Table 1.
Socio-demographic characteristics of students included in the analyses.
| Boys | Girls | |
|---|---|---|
| Total, n (%) | 9078 (49.2) | 9384 (50.8) |
| Age, years (SD) | 15.91 (1.53) | 15.90 (1.51) |
| Weight status, n (%) | ||
| Underweight | 454 (5.0) | 1087 (11.6) |
| Normal-weight | 6836 (75.3) | 7311 (77.9) |
| Overweight/obese | 1788 (19.7) | 986 (10.5) |
| Grade, n (%) | ||
| Grade 7 | 1340 (14.8) | 1359 (14.5) |
| Grade 9 | 4077 (44.9) | 4165 (44.4) |
| 2 years upper secondary school | 3661 (40.3) | 3860 (41.1) |
| Parent’s ethnic background, n (%) | ||
| Swedish | 7071 (77.9) | 7214 (76.9) |
| Mixed | 1029 (11.3) | 1107 (11.8) |
| Foreign | 978 (10.8) | 1063 (11.3) |
| Household structure, n (%) | ||
| Living with both parents | 6040 (66.5) | 6060 (64.6) |
| Another family structure | 3038 (33.5) | 3324 (35.4) |
| School location, n (%) | ||
| Larger towns and municipalities near large towns | 5535 (61.0) | 5991 (63.8) |
| Smaller towns/urban areas and rural municipalities | 3543 (39.0) | 3393 (36.2) |
| Parent’s employment, n (%) | ||
| At least 1 parent is employed | 8808 (97.0) | 9069 (96.6) |
| Unemployed/students/on sick leave/ on disability pension/on parental leave/other | 270 (3.0) | 315 (3.4) |
| Psychosomatic complaints, n (%) | ||
| Less complaints (below P90) | 8730 (96.2) | 7741 (82.5) |
| More complaints (at/above P90) | 348 (3.8) | 1643 (17.5) |
| Psychosomatic complaints index, Mean (SD) | 8.71 (5.03) | 13.17 (5.65) |
SD standard deviation; P90 90th percentile.