Patient details
| Femoral venous catheters (n=42) | Femoral arterial catheters (n=23) | |
| Gestational age (weeks) | 32 (23–40) | 27 (23–37) |
| Birth weight (g) | 1713 (474–3710) | 845 (550–3480) |
| Age at insertion (days) | 24 (1–140) | 3 (1–112) |
| Weight at insertion (g) | 2265 (452–6600) | 1002 (550–6600) |
| Duration in situ (days) | 7 (1–29) | 3 (1–8) |
Each variable is expressed as median (range).