Demographic data for 495 EVD catheters
| Patient characteristics | No. | % |
| Age | ||
| Mean (SD) | 51.8 (19.2) | – |
| Median (IQR) | 54 (41–67) | – |
| Age groups | ||
| 0–17 | 37 | 7.4 |
| 18–29 | 34 | 6.8 |
| 30–39 | 45 | 9.1 |
| 40–49 | 78 | 15.8 |
| 50–59 | 113 | 22.8 |
| 60–69 | 103 | 20.8 |
| 70–79 | 66 | 13.3 |
| 80–89 | 15 | 3.0 |
| 90+ | 4 | 1.0 |
| Gender | ||
| Female | 261 | 52.7 |
| Male | 234 | 47.3 |
| Pathology | ||
| Congenital, IIH and NPH | 12 | 2.4 |
| Shunt dysfunction | 19 | 3.8 |
| Neurovascular | 321 | 64.9 |
| Other | 20 | 4.0 |
| Trauma | 35 | 7.1 |
| Tumour | 88 | 17.8 |
| Preoperative ASA status | ||
| 1 | 117 | 23.6 |
| 2 | 108 | 21.8 |
| 3 | 111 | 22.4 |
| 4 | 131 | 26.5 |
| 5 | 28 | 5.7 |
ASA, American Society of Anaesthesiologists; EVD, external ventricular drain; IIH, idiopathic intracranial hypertension; NPH, normal pressure hydrocephalus.