Table 1).
| Variable | No NEC | NEC medical treatment | NEC drain | NEC laparotomy | NEC drain and laparatomy |
|---|---|---|---|---|---|
| Patient number | 11426 | 334 | 41 | 144 | 29 |
| Birth weight mean, g (SD) | 1137 (455) | 1113(446) | 844 (249) | 1088 (387) | 941(435) |
| Gestational age at birth, wk mean (SD) | 29.1 (2.5) | 27.5 (2.6) | 25.4 (2.0) | 27.3 (2.5) | 26.4 (2.2) |
| IVH Grade III or higher, n (%) | 1059 (11%) | 56 (18%) | 14 (35%) | 36 (26%) | 9(31%) |
| PVL, n (%) | 410 (4%) | 22 (7%) | 2(5%) | 22(16%) | 5(17%) |
| Week 36 head circumference, cm mean (SD) | 31.6 (1.8) | 30.7(2.1) | 30.2 (1.2) | 30.6 (2.4) | 30.1 (2.4) |
| Mortality, n (%) | 670 (6%) | 63(19%) | 29 (71%) | 55 (38%) | 14 (48%) |