Table 1 Sociodemographic characteristic of the study population (n = 2913) according to the age groups
Overall n (%) | Age group | p | |||
|---|---|---|---|---|---|
6–9 years n (%) | 10–12 years n (%) | 13–17 years n (%) | |||
Sex | |||||
Boys | 1419 (48.7) | 413 (47.6) | 456 (47.8) | 550 (50.4) | 0.384 |
Girls | 1494 (51.3) | 454 (52.4) | 498 (52.2) | 542 (49.6) | |
Place of residence | |||||
Rural | 201 (6.9) | 48 (5.5) | 66 (6.9) | 87 (8.0) | 0.067 |
Small city (< 20 000 citizens) | 16 (0.5) | 4 (0.5) | 3 (0.3) | 9 (0.8) | |
Average city (20 000–100 000 citizens) | 8 (0.3) | 0 (0.0) | 3 (0.3) | 5 (0.5) | |
Big city (Wroclaw) (> 100 000 citizens) | 2688 (92.3) | 815 (94.0) | 882 (92.4) | 991 (90.8) | |
BMI (kg/m2) | |||||
M ± SD | 18.1 ± 3.3 | 16.1 ± 2.5 | 17.7 ± 3.1 | 19.9 ± 3.1 | < 0.001* |
Me [Q1; Q3] | 18 [16; 20] | 16 [14; 17] | 17 [16; 19] | 20 [18; 21] | |
Min—Max | 9–40 | 10–32 | 11–40 | 9–33 | |