Table 1.
Study participants characteristics (total study group and by BMI category)
| Characteristics | Total study group | Thinness and normal weight* | Overweight (including obesity)* |
|---|---|---|---|
| n (%) | n (%) | n (%) | |
| Age group (years) | |||
| 6.0–6.9 | 1098 (10.5) | 803 (73.1) | 295 (26.9) |
| 7.0–7.9 | 5857 (56.0) | 4269 (72.9) | 1588 (27.1) |
| 8.0–8.9 | 3044 (29.1) | 2216 (72.8) | 828 (27.2) |
| 9.0–9.9 | 454 (4.3) | 353 (77.8) | 101 (22.3) |
| Sex | |||
| Boys | 5290 (50.6) | 3788 (71.6) | 1502 (28.4) |
| Girls | 5163 (49.4) | 3853 (74.6) | 1310 (25.4) |
| Country | |||
| Bulgaria | 2251 (21.5) | 1592 (70.7) | 659 (29.3) |
| Czech Republic | 1206 (11.5) | 960 (79.6) | 246 (20.4) |
| Lithuania | 2767 (26.5) | 2081 (75.2) | 686 (24.8) |
| Portugal | 1788 (17.1) | 1119 (62.6) | 669 (37.4) |
| Sweden | 2441 (23.4) | 1889 (77.4) | 552 (22.6) |
| Maximum educational level of parents | |||
| Primary school | 804 (7.7) | 589 (73.3) | 215 (26.7) |
| Secondary school | 4808 (46.0) | 3443 (71.6) | 1365 (28.4) |
| Undergraduate/bachelor’s degree | 3120 (29.9) | 2305 (73.9) | 815 (26.1) |
| Master’s degree or higher | 1721 (16.5) | 1304 (75.8) | 417 (24.2) |
BMI, body mass index.
*BMI classification according to WHO criteria [35].