Clinical characteristics of study cohort
| Birth weight g (mean±SD) | 1351±940 |
| Gestational age weeks (mean±SD) | 28.3±4.4 |
| Age in weeks at EVD insertion (mean±SD) | 32.5±5.1 |
| IVH II n (%) | 3 (17.6) |
| IVH III n (%) | 10 (58.8) |
| IVH IV n (%) | 4 (23.5) |
| Days of life at EVD insertion (mean±SD) | 24.4±14.3 |
| Definite VP-shunt insertion n (%) | 13 (72.2) |
EVD, external ventricular drainage; IVH, intraventricular haemorrhage; VP-shunt, ventriculo-peritoneal shunt.