Table 2.
Body fat at 1.5 and 24 months by skinfold thicknesses and at 6 years old by dual-energy X-ray absorptiometry and abdominal ultrasounda
| Total group | Boys | Girls | P-value | |
|---|---|---|---|---|
| 1.5 months | n = 742 | n = 372 | n = 370 | |
| Age (months), mean (SD) | 1.6 (0.4) | 1.6 (0.4) | 1.6 (0.5) | 0.340 |
| Body mass index (kg/m2), mean (SD) | 15.1 (1.4) | 15.3 (1.5) | 15.0 (1.3) | 0.001 |
| Total subcutaneous fat mass (mm), mean (SD) | 23.9 (7.1) | 23.8 (7.0) | 24.0 (7.1) | 0.705 |
| Central-to-total subcutaneous fat mass ratio, mean (SD) | 0.50 (0.05) | 0.49 (0.05) | 0.51 (0.05) | <0.001 |
| 24 months | n = 746 | n = 381 | n = 365 | |
| Age (months), mean (SD) | 25.2 (1.1) | 25.3 (1.1) | 25.2 (1.1) | 0.408 |
| Body mass index (kg/m2), mean (SD) | 15.9 (1.3) | 16.0 (1.3) | 15.9 (1.3) | 0.145 |
| Total subcutaneous fat mass (mm), mean (SD) | 27.4 (7.5) | 26.7 (7.2) | 28.1 (7.7) | 0.012 |
| Central-to-total subcutaneous fat mass ratio, mean (SD) | 0.43 (0.06) | 0.42 (0.06) | 0.44 (0.06) | 0.001 |
| 6 years | n = 821 | n = 412 | n = 409 | |
| Age (years), mean (SD) | 6.0 (0.3) | 6.0 (0.3) | 6.0 (0.2) | 0.450 |
| Body mass index (kg/m2), mean (SD) | 15.9 (1.4) | 15.9 (1.3) | 15.9 (1.5) | 0.955 |
| Overweight and obese (IOTF), n (%) | 88 (10.7) | 34 (8.3) | 54 (13.2) | 0.023 |
| Fat mass index (kg/m3), mean (SD) | 3.2 (0.8) | 2.9 (0.7) | 3.4 (0.9) | <0.001 |
| Central-to-total fat mass ratio, mean (SD) | 0.33 (0.04) | 0.32 (0.03) | 0.34 (0.04) | <0.001 |
| Android-to-gynoid fat mass ratio, mean (SD) | 0.24 (0.05) | 0.24 (0.05) | 0.25 (0.06) | 0.089 |
| Preperitoneal fat mass area (cm2), median (95% range) | 0.4 (0.2-0.9) | 0.3 (0.2-0.7) | 0.4 (0.2-1.0) | <0.001 |
a
Values are expressed as means (SD), medians (95% range) or numbers of subjects (valid %). Body mass index = weight/height2. Total subcutaneous fat mass = biceps + triceps + suprailiacal + subscapular skinfold thicknesses. Central-to-total subcutaneous fat mass ratio = (suprailiacal + subscapular skinfold thicknesses)/total subcutaneous fat mass. Fat mass index = total fat mass/height3. Central-to-total fat mass ratio = trunk fat mass/total fat mass. Android-to-gynoid fat mass ratio = android fat mass/gynoid fat mass. IOTF, International Obesity Task Force. SD, standard deviation.