Table 1. Characteristics of study participants stratified by sex (n = 568).
| n = | Boys | n = | Girls | p = | |
|---|---|---|---|---|---|
| Age (year) | 269 | 13.0 (0.6) | 299 | 12.9 (0.6) | 0.01* |
| Body weight (kg) | 267 | 49.6 (10.8) | 292 | 50.4 (10.1) | 0.42 |
| Body height (cm) | 268 | 159.9 (8.8) | 292 | 159.8 (7.0) | 0.94 |
| BMI (kg/m2) | 267 | 19.3 (3.1) | 292 | 19.6 (3.3) | 0.18 |
| Waist circumference (cm) | 267 | 72.4 (8.6) | 291 | 69.0 (8.7) | <0.01* |
| Overweight (%) | 267 | 13.9 | 292 | 16.4 | 0.40 |
| Tanner stages (n) | 262 | 11/65/110/62/14 | 286 | 1/13/149/108/15 | <0.01* |
| SES (n) | 269 | 49/122/98 | 299 | 37/140/122 | 0.14 |
| Special teaching (%) | 265 | 9.8 | 297 | 6.7 | 0.18 |
| Breakfast consumption (%) | 269 | 91.5 | 299 | 89.0 | 0.32 |
| Mathematic score (%) | 269 | 43.9 (21.2) | 299 | 39.4 (19.2) | 0.01* |
| Reaction Time—congruent (ms) | 269 | 458.4 (72.1) | 299 | 466.8 (65.0) | 0.15 |
| Accuracy—congruent (%) | 269 | 95.0 (6.3) | 299 | 94.8 (6.5) | 0.73 |
| Reaction Time—incongruent (ms) | 269 | 537.5 (85.9) | 299 | 547.1 (83.1) | 0.18 |
| Accuracy—incongruent (%) | 269 | 80.5 (12.7) | 299 | 84.2 (10.9) | <0.01* |
| Total PA (cpm) | 145 | 436.1 (142.2) | 200 | 394.7 (131.6) | 0.01* |
| Total MVPA (minutes/day) | 145 | 53.5 (21.4) | 200 | 45.2 (15.6) | <0.01* |
| Organized sports participation (%) | 243 | 82.31 | 279 | 74.9 | 0.04* |
| Transport mode (n) | 268 | 106/63/99 | 299 | 138/52/109 | 0.13 |
BMI; Body Mass Index. Overweight; comprising obesity. Tanner stages; comprising five developmental stages corresponding to secondary sex characteristics (stage 1 indicating immaturity/stage 2–4 indicating degrees of maturation/stage 5 indicating maturity). SES; Socio-Economic Status (comprising no formal education/vocational training or < 3.5 years of adult education/≥3.5 years of adult education). PA; physical activity. MVPA; moderate-to-vigorous physical activity. Transport mode; car or public transport/walk/bicycling. All values are crude means with standard deviations unless stated otherwise.
* Two-sided alpha ≤0.05 indicating a significant difference between sexes.