Table 2

Inter-observer variability for optic nerve (and sheath) diameters

Optic nerve diameter

Optic nerve sheath diameter

Mean standard deviation (mm)

0.25

0.17

Mean difference (mm)

0.30

0.11

The inter-observer variability was tested in 23 randomly selected magnetic resonance imaging datasets.

Geeraerts et al. Critical Care 2008 12:R114   doi:10.1186/cc7006