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Table 2 Inter-observer variability for optic nerve (and sheath) diameters

From: Use of T2-weighted magnetic resonance imaging of the optic nerve sheath to detect raised intracranial pressure

  Optic nerve diameter Optic nerve sheath diameter
Mean standard deviation (mm) 0.25 0.17
Mean difference (mm) 0.30 0.11
  1. The inter-observer variability was tested in 23 randomly selected magnetic resonance imaging datasets.