Variation range for different groups
| Elevated ICP (n=18) | Normal ICP (n=66) | |||
| Before LP | After LP | Before LP | After LP | |
| ONSD range (mm) | 4.02-5.63 | 3.87-5.01 | 3.57-4.70 | 3.26-4.61 |
| ICP range (mmH2O) | 200-400 | 110-240 | 90-195 | 70-180 |
ICP, intracranial pressure; LP, lumbar puncture; ONSD, optic nerve sheath diameter.