Table 2.

Bland Altman Test for ONSD measurement of transverse and sagittal section

	Mean value (mm)	%95 CI of mean value (mm)	Agreement P value	Proportional bias P value
Difference between mtONSD	− 0.113 ± 0.466	(− 0.276)–(0.049)	0.166*	0.544**
Difference between msONSD	− 0.096 ± 0.366	(− 0.224)–(0.031)	0.135*	0.868**
Difference between mONSD	− 0.101 ± 0.315	(− 0.210)–(0.007)	0.066*	0.929**

CI Confidence Interval, mm millimeter, mtONSD average of three ONSD measurements obtained from the transverse section of the eye with each USG device, msONSD average of three ONSD measurements obtained from the sagittal section of the eye with each USG device, mONSD average of mtONSD and msONSD

*There is agreement

**There is no proportional bias