Descriptive characteristics (means±SD) of male and female infants at birth
| Male (n=151) | Female (n=164) | Effect size (η2) | |
| Gestational age (weeks) | 39.5±1.2 | 39.5±1.2 | 0.001 |
| Age (days) | 1.8±1.1 | 1.8±1.2 | 0.001 |
| Weight-ADP | 3.3±0.5 | 3.2±0.4 | 0.013 |
| %FM | 9.6±3.6 | 11.4±4.1 | 0.048 |
| %FFM | 90.4±3.6 | 88.6±4.1 | 0.048 |
| FM (kg) | 0.3±0.2 | 0.4±0.2 | 0.019 |
| FFM (kg) | 3.0±0.4 | 2.9±0.3 | 0.044 |
| Length (cm) | 50.0±2.1 | 49.0±2.1 | 0.046 |
| Head circumference (cm) | 34.6±1.3 | 34.1±1.2 | 0.044 |
| Weight-for-length (kg/m) | 6.7±0.7 | 6.6±0.7 | 0.005 |
| BMI | 13.4±1.3 | 13.4±1.3 | 0.001 |
ADP, air displacement plethysmography; BMI, Body Mass Index; %FFM, percentage fat-free mass; FFM, fat-free mass; FM, fat mass; %FM, percentage fat mass.