Table 3.

Effects of clinical factors on OCT measurement variability - Baseline model (Multivariable analysis)

Variable	β Coefficient	SE	P-value
(Intercept)	−0.131	1.388	0.925
Age, per 1 year older	0.003	0.003	0.436
Gender: Female (vs. male)	−0.028	0.065	0.669
Race: African American (vs. others)	0.214	0.071	0.003
Diabetes (yes/no)	0.070	0.092	0.449
Hypertension (yes/no)	−0.023	0.069	0.739
Laterality: Right eye	0.040	0.048	0.401
CCT, per 1 μm thicker	0.001	0.001	0.743
AL, per 1 mm longer	0.023	0.031	0.470
Spherical equivalent, per 1 D higher	0.033	0.019	0.088
Baseline VF MD, per 1 dB higher	−0.022	0.007	0.003
Baseline IOP, per 1 mmHg higher	−0.005	0.007	0.511
Baseline medication use (yes/no)	0.116	0.086	0.181
History of CE at baseline (yes/no)	−0.126	0.090	0.163
History of glaucoma surgery at baseline (yes/no)	0.287	0.081	< 0.001
Baseline RNFLT, per 1 μm thicker	0.007	0.003	0.006
	Total R2: 0.68

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

Abbreviation: AL = axial length, CCT = central corneal thickness, CE = cataract extraction, IOP = intraocular pressure, OCT = optical coherence tomography, RNFLT= RNFL thickness, SE = standard error, VF MD = visual field mean deviation