Skip to main content

Advertisement

Table 3 Interobserver and intraobserver repeatability of the optic nerve-sheath complex measurements by MRI

From: Noninvasive intracranial pressure estimation by orbital subarachnoid space measurement: the Beijing Intracranial and Intraocular Pressure (iCOP) study

Measurement Interobservera Intraobserverb
Difference (95% LoA) (mm) ICC (95% CI) Difference (95% LoA) (mm) ICC (95% CI)
Optic nerve-sheath diameter     
 At 3 mm behind the globe 0.17 (−0.10-0.45) 0.96 (0.93–0.98) −0.04 (−0.43-0.35) 0.99 (0.99–0.99)
 At 9 mm behind the globe 0.23 (−0.31-0.77) 0.95 (0.90–0.98) −0.01 (−0.38-0.36) 0.96 (0.92–0.98)
 At 15 mm behind the globe 0.22 (−0.10-0.54) 0.97 (0.93–0.98) −0.08 (−0.37-0.20) 0.98 (0.97–0.99)
Optic nerve diameter     
 At 3 mm behind the globe 0.17 (−0.10-0.40) 0.92 (0.84–0.96) −0.15 (−0.42-0.12) 0.99 (0.99–0.99)
 At 9 mm behind the globe 0.20 (−0.11-0.51) 0.86 (0.74–0.93) −0.18 (−0.46-0.11) 0.94 (0.88–0.97)
 At 15 mm behind the globe 0.21 (−0.12-0.54) 0.84 (0.68–0.92) −0.17 (−0.40-0.10) 0.97 (0.95–0.98)
  1. The intraclass correlation coefficient (ICC) was calculated to determine the degree of interobserver and intraobserver reliability. The intraobserver and interobserver variabilities were determined by Bland–Altman analysis. CI confidence interval, LoAs limits of agreement. aBased on the first measurements of the first observer and measurements of the second observer. bBased on the first and second measurements of the first observer.