Number (M/F) | 15 (8/7) | 15 (7/8) | 12 (7/5) |
Gestational age (weeks) | 31.2 (0.6) | 31.5 (0.5) | 31.4 (0.9) |
Weight at birth (g) | 1585 (241) | 1600 (228) | 1601 (321) |
Length at birth (cm) | 41.4 (2.0) | 41.4 (1.9) | 41.6 (2.9) |
Head circumference at birth (cm) | 29.6 (1.8) | 29.9 (1.2) | 29.9 (1.9) |
Age at study entry (days) | 8.5 (1.8) | 8.3 (3.0) | 7.9 (3.2) |
Feeding volume (ml/kg/day) | 175.6 (19.5) | 171.5 (19.8) | 186.7 (20.3) |
Weight gain during study period (g/day) | 29.8 (4.1) | 29.8 (4.0) | 29.7 (3.3) |
Length gain during study period (cm/week) | 0.98 (0.05) | 0.99 (0.05) | 1.01 (0.04) |