Table 4.

Effect of age, SSI, 24-2 VF MD, and IOP on the variability of OCTA and OCT measurements for ONH parameters

	Coefficient, 95% CI	R-squared, 95% CI	p value
wiCD
Age	−0.14 (−0.22, −0.06)	0.29 (0.20, 0.39)	0.001
SSI	0.58 (0.23, 0.94)	0.05 (0.01, 0.12)	0.002
24-2 VF MD	0.65 (0.11, 1.19)	0.17 (0.09, 0.26)	0.022
IOP	−0.08 (−0.27, 0.10)	0.03 (0.00, 0.09)	0.386
cpCD
Age	−0.15 (−0.24, −0.06)	0.29 (0.20, 0.39)	0.002
SSI	0.23 (−0.16, 0.61)	0.01 (0.00, 0.05)	0.247
24-2 VF MD	0.62 (0.02, 1.21)	0.14 (0.06, 0.23)	0.045
IOP	−0.12 (−0.32, 0.08)	0.05 (0.01, 0.12)	0.237
cpRNFL
Age	−0.43 (−0.75, −0.11)	0.49 (0.40, 0.57)	0.011
SSI	0.26 (−0.31, 0.83)	0.00 (0.00, 0.03)	0.374
24-2 VF MD	1.08 (−0.89, 3.04)	0.12 (0.05, 0.20)	0.287
IOP	0.01 (−0.64, 0.65)	0.00 (0.00, 0.02)	0.984

CD = capillary density; CI = confidence interval; cp = circumpapillary; IOP = intraocular pressure; MD = mean deviation; OCT = optical coherence tomography; OCTA = optical coherence tomography angiography; ONH = optic nerve head; RNFL = retinal nerve fiber layer; SSI = signal strength index; VD = vessel density; VF = visual field; wi = whole image. Values are shown in β coefficient (95% confident interval). Negative coefficient demonstrates that reproducibility decreased with increasing the values of the putative factor. Statistically significant p value is shown in bold.