Table 4.

Effects of clinical factors on OCT measurement variability – Parsimonious model (Multivariable analysis)

Variable	β Coefficient	SE	P-value
(Intercept)	1.492	0.757	0.049
Race: African American (vs. others)	0.180	0.061	0.003
CE during follow-up (yes/no)	0.511	0.069	< 0.001
Glaucoma surgery during follow-up (yes/no)	0.195	0.070	0.006
RNFL thinning rate, per 1 μm/year more positive	0.057	0.022	0.010
Visit/testing frequency, per 1 times/year higher	−0.106	0.054	0.050 *
	Total R2: 0.77

^*A positive co-efficient indicates increased RNFLT variability, while a negative co-efficient indicates decreased RNFLT variability.

Abbreviation: CE = cataract extraction, OCT = optical coherence tomography, RNFL= retinal never fiber layer, SE = standard error

^*P-value = 0.0496