Table 1 Descriptive characteristics of the individuals included in the analytical sample (n = 1656) and those excluded because of loss to follow-up or missing information on key variables (n = 1802)
Characterstics |  | Included (n = 1656) | Excluded (n = 1802) | n in the excluded group* | p-value, χ2/t-test |
|---|---|---|---|---|---|
Crude mean BMI at baseline (std. dev) | Â | 21.0 (3.0) | 20.9 (3.1) | 1,663 | 0.53 |
Age adjusted BMI according to IOTF criteria[33] | < 25 | 84.7% | 82.8% | 1,087 | 0.19 |
|  | ≥25 | 15.3% | 17.2% |  |  |
Age at baseline | Â | Â | Â | Â | Â |
| Â | 13 | 0.6% (10) | 0.4% (7) | Â | Â |
| Â | 14 | 24.5% (405) | 22.3% (401) | Â | Â |
| Â | 15 | 69.0% (1143) | 69.4% (1248) | 1,799 | 0.11 |
| Â | 16 | 5.7% (95) | 7.5% (135) | Â | Â |
| Â | 17 | 0.1% (2) | 0.4% (7) | Â | Â |
| Â | 18 | 0.1% (1) | 0.1% (1) | Â | Â |
Sex | Â | Â | Â | Â | Â |
| Â | Male | 38.1% (631) | 54.5% (982) | 1,802 | < 0.0001 |
| Â | Female | 61.9% (1025) | 45.5% (820) | Â | Â |
Lives with | Â | Â | Â | Â | Â |
| Â | Biological parents | 75.2% (1246) | 67.9% (1186) | Â | Â |
| Â | One biological, one cohabitant | 11.0% (182) | 14.4% (251) | 1,748 | < 0.0001 |
| Â | One parent | 12.2% (202) | 15.2% (265) | Â | Â |
| Â | Other than parents | 0.7% (12) | 1.6% (28) | Â | Â |
| Â | Not known | 0.9% (14) | 1.0% (18) | Â | Â |
Socioeconomic position, highest of the parents | Unemployed | 5.7% (94) | 11.8% (212) | Â | Â |
| Â | Non-skilled manual worker | 7.6% (125) | 10.2% (184) | 1,802 | < 0.0001 |
| Â | Under education | 1.3% (21) | 2.3% (42) | Â | Â |
| Â | Skilled manual worker | 9.5% (157) | 10.0% (181) | Â | Â |
| Â | White-collar group 3 | 19.1% (317) | 18.8% (338) | Â | Â |
| Â | White-collar group 2 | 26.2% (433) | 20.9% (377) | Â | Â |
| Â | White-collar group 1 | 18.7% (309) | 13.4% (242) | Â | Â |
| Â | Self-employed | 12.1% (200) | 12.5% (226) | Â | Â |
Total | Â | 100% | 100% | Â | Â |