Cranial ultrasound findings and survival data
| Cases n=31 | Controls n=25 | P value | |
| Presence of any grade of IVH (%) | 25 (80.6) | 17 (68.0) | 0.357 |
| IVH grade (%) | 0.282 | ||
| Nil | 6 (19.4) | 8 (32) | |
| I | 5 (16.1) | 0 (0) | |
| II | 6 (19.4) | 6 (24) | |
| III | 5 (16.1) | 4 (16) | |
| IV | 9 (29.0) | 7 (28) | |
| PVL diagnosis (%) | 6 (19.4) | 2 (8.0) | 0.277 |
| Survival to discharge (%) | 15 (48.4) | 13 (52.0) | 1.000 |
IVH, intraventricular haemorrhage; PVL, periventricular leukomalacia.