Table 1.
Descriptive characteristics
| Boys | Girls | P * | |
|---|---|---|---|
| n | 62 | 70 | |
| Pubertal stage 1–5 (%) | 34; 24; 11; 11; 19 | 14; 11; 19; 43; 13 | |
| Age (years) | 12.4 (9.2; 14.9) | 12.3 (9.1; 15.2) | NS |
| Fat mass (kg) | 7.5 (5.1; 15.8) | 9.6 (5.2; 15.0) | 0.042 |
| Lean mass (kg) | 34.1 (23.7; 52.8) | 32.5 (22.4; 44.2) | NS |
| Fasting insulin (pmol/l) | 43 (21; 72) | 49 (32; 91) | 0.010 |
| Fasting glucose (mmol/l) | 4.8 (4.1; 5.5) | 4.8 (4.2; 5.3) | NS |
| Mean AUCinsulin (pmol/l) | 242 (118; 379) | 248 (155; 458) | NS |
| Mean AUCglucose (mmol/l) | 5.8 (4.5; 7.3) | 5.5 (4.6; 6.7) | NS |
| WBISI‡ | 2.1 (1.3; 4.3) | 1.9 (1.0; 3.0) | NS |
| Insulin release (pmol)§ | 1,002 (635; 1,647) | 1,305 (876; 2,088) | 0.003 |
| Disposition index | 2,260 (1,377; 3,924) | 2,492 (1,524; 3,555) | NS |
| Vo2max (ml · kg−1 · min−1)‖ | 46.8 (35.6; 55.0) | 40.0 (33.4; 48.0) | <0.001 |
| Triglycerides (mmol/l) | 0.61 (0.43; 1.11) | 0.79 (0.53; 1.36) | 0.001 |
| HDL cholesterol (mmol/l) | 1.47 (1.15; 1.88) | 1.52 (1.04; 1.84) | NS |
| Mean ABP (mmHg) | 78.3 (70.0; 93.3) | 76.7 (71.7; 90.0) | NS |
| Waist circumference Z score | 0.22 (−0.99; 1.34) | 0.07 (−1.02; 1.32) | NS |
| Metabolic Z score¶ | −0.13 (−0.56; 0.78) | 0.04 (−0.53; 0.77) | NS |
| hsCRP (mg/l) | 0.28 (0.16; 1.40) | 0.28 (0.16; 2.68) | NS |
| SHBG (nmol/l) | 63.0 (23.0; 122.0) | 81.5 (34.5; 130.5) | NS |
Data are medians (10th percentile; 90th percentile).
*Comparisons between boys and girls by a Mann-Whitney U test.
‡Insulin sensitivity (ref. 13).
§Insulin release as first-phase (ref. 14).
‖Vo2max indicates predicted aerobic fitness.
¶Z score represents the SD score. ABP, arterial blood pressure; AUC, area under the curve. NS, nonsignificant (P > 0.05).