Table 1.
Characteristics of the subjects. Values are expressed as means ± standard deviation, or frequencies (percentages). MVPA—moderate-to-vigorous-intensity physical activity; METs—total time of MVPA.
| All (N = 248) | Males (N = 118) | Females (N = 130) | p-Value | |
|---|---|---|---|---|
| Age (years) | 14.2 ± 0.9 | 14.2 ± 0.9 | 14.2 ± 0.9 | 0.973 |
| Body height (cm) | 157.8 ± 7.8 | 161.4 ± 8.2 | 154.5 ± 5.7 | 0.001 |
| Body weight (kg) | 50.6 ± 10.3 | 52.5 ± 12.1 | 48.9 ± 8.0 | 0.006 |
| Body mass index (kg/m2) | 20.4 ± 3.3 | 20.1 ± 3.6 | 20.6 ± 2.9 | 0.312 |
| Pubertal change | ||||
| No | 35 | 19 (15%) | 16 (11%) | |
| Yes | 213 | 99 (85%) | 114 (89%) | |
| MVPA (METs-min/wk) | 5455.4 ± 3638.0 | 6651.1 ± 4026.9 | 4370.1 ± 2853.0 | 0.001 |
| Overnight urine | ||||
| Urea nitrogen (mg/dL) | 1207.7 ± 296.9 | 1260.7 ± 282.2 | 1159.7 ± 302.7 | 0.007 |
| Creatinine (mg/dL) | 167.4 ± 65.0 | 172.1 ± 60.0 | 163.1 ± 69.1 | 0.276 |
| 24-h urine | N = 21 | N = 37 | ||
| Collection period (h) | 22.6 ± 0.9 | 22.6 ± 1.1 | 22.6 ± 0.8 | 0.811 |
| Urine volume (mL) | 966.3 ± 374 | 952.5 ± 320.1 | 974.2 ± 403.4 | 0.833 |
| Urea nitrogen (mg/dL) | 879.8 ± 288.6 | 941.7 ± 292.2 | 844.7 ± 284.6 | 0.222 |
| Creatinine (mg/dL) | 114.5 ± 42.2 | 121.2 ± 39.9 | 110.7 ± 43.5 | 0.367 |
p-Values indicate comparison between genders. MVPA, moderate or vigorous physical activity; MET, metabolic equivalent.