Optic nerve sheath diameter values for patients in groups 1–4
| ONSD | |||||
|---|---|---|---|---|---|
| Group | Number | Clinical features | Range | Mean | SD |
| 1 | 102 | Normal | 2.1–4.3 mm | 3.1 mm | 0.36 |
| 2 | 6 | Hydrocephalus, normotensive | 2.1–3.6 mm | 2.9 mm | 0.5 |
| 3 | 5 | Hydrocephalus, symptoms of suggestive of raised ICP, not requiring intervention | 2.6–3.8 mm | 3.1 mm | 0.4 |
| 4 | 12 | Hydrocephalus, symptoms suggestive of raised ICP, requiring intervention | 4.5–7.0 mm | 5.9 mm | 0.6 |