Morphological data of the three groups of boys with birth weight ⩾ 2500 g; values are mean (SD)
| Group 1 | No of boys | Group 2 | No of boys | Group 3 | No of boys | |
|---|---|---|---|---|---|---|
| At birth | ||||||
| Weight (g) | 3320 (440) | 106 | 3390 (370) | 52 | 3410 (420) | 41 |
| Length (cm) | 50.1 (2.0) | 106 | 50.3 (1.9) | 52 | 50.6 (1.9) | 40 |
| Head circumference (cm) | 34.8 (1.3) | 102 | 34.7 (1.3) | 50 | 35.1 (1.1) | 40 |
| At 2 years | ||||||
| Weight (kg) | 12.3 (1.4) | 106 | 12.4 (1.2) | 52 | 12.7 (1.3) | 41 |
| Height (cm) | 86.8 (3.0) | 106 | 87.5 (3.0) | 52 | 87.6 (2.5) | 41 |
| Head circumference (cm) | 49.2 (1.3) | 104 | 49.5 (1.0) | 52 | 49.8 (1.2) | 401-150 |
↵1-150 p < 0.02 (group 3 v group 1).