Table 2. Associations between mean global retinal nerve fiber layer thickness as measured by spectral domain optical coherence tomography (iVue SD-OCT) and ocular and systemic parameters in the Beijing Eye Study 2011 (univariate analysis).

Parameter	P-Value	Regression Coefficient B (or Mean Difference)	Standardized Coefficient Beta	95% Conf. Interval of B or Mean Difference
Cholesterol (mmol/L)	0.007	1.03	0.08	0.28, 1,78
Prevalence of: Diabetes Mellitus	<0.001	3.95		3.19, 5.70
Arterial Hypertension	<0.001	3.12		1.86, 4.36
Best Corr. Visual Acuity (logMAR)	<0.001	−25.2	−0.26	−29.7, −20.7
Refractive Error (Diopters)	<0.001	1.40	0.23	1.11, 1.68
Axial Length (mm)	<0.001	−3.18	−0.28	−3.71, −2.64
Ant. Corneal Curvature Radius (mm)	0.008	−4.36	−0.09	−6.71, −2.00
Central Corneal Thickness (µm)	0.06
Anterior Chamber Depth (mm)	<0.001	−2.42	−0.10	−3.58, −1.27
Lens Thickness (mm)	<0.001	−3,94	−0.11	−5.81, −2.06
Lens Refractive Power (Diopters)	<0.001	1.07	0.18	0.76, 1.38
Optic Disc Area (mm2)	<0.001	5.25	0.17	3.75, 6.74
Neuroretinal Rim Area (mm2)	<0.001	10.74	0.34	9.32, 12.16
Horizontal Cup/Disc Diameter Ratio	<0.001	−6.30	−0.13	−8.63, −3.97
Vertical Cup/Disc Diameter Ratio	<0.001	−13.0	−0.24	−15.56, −10.51
Parapapillary Atrophy (mm2)
Alpha Zone	0.01	−1.50	−0.07	−2.64, −0.35
Beta Zone	<0.001	−1.96	−0.18	−2.57, −1.35
Choroidal Thickness (µm)	<0.001	0.04	0.35	0.04, 0.05
Intraocular Pressure (mmHg)	0.20
Ocular Perfusion Pressure (mmHg)	0.80
Corneal Diameter	0.27
Scleral Spur Distance (mm)	0.52
Pupil Diameter (mm)	0.06
Pupil Distance (mm)	0.11