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Table 2 Comparison of transorbital sonography and MR imaging

From: Reproducibility and accuracy of optic nerve sheath diameter assessment using ultrasound compared to magnetic resonance imaging

  Scan 1
Bland-Altman Correlation
  d σd r P value
ONSD 3 mm −0.25 ±1.06 0.72 0.002
ONSD 5 mm 0.43 ±0.82 0.78 <0.001
  1. d, mean difference; σd, limits of agreement; r, correlation coefficient.