Characteristics of infants in each weight category
| Weight category | <1000 g (n=15) | 1000–1500 g (n=15) | >1500 g (n=14) | All infants | ||||
| Mean | Median (range) | Mean | Median (range) | Mean | Median (range) | Mean | Median (range) | |
| Birth gestation (weeks) | 27.0 | 27.6 (23.1–30.4) | 27.2 | 27.6 (23.6–31.1) | 26.8 | 26.7 (23.3–31.6) | 27.0 | 26.9 (23.1–31.6) |
| Current gestation (weeks) | 30.4 | 30.1 (28.3–33.3) | 31.7 | 31.6 (29.9–34.3) | 35.6 | 34.3 (31.1–42.1) | 32.5 | 31.8 (28.3–42.1) |
| Age (days) | 26.9 | 15 (4–87) | 32.9 | 36 (3–76) | 61.6 | 58 (5–132) | 40 | 35 (3–132) |
| Birth weight (g) | 750 | 720 (500–1140) | 970 | 920 (500–1440) | 970 | 850 (520–1900) | 890 | 850 (500–1900) |
| Current weight (g) | 880 | 910 (610–1000) | 1310 | 1250 (1140–1500) | 2150 | 1870 (1520–4200) | 1430 | 1250 (610–4200) |