Table 4.

Multiple Linear Regression of Demographic and Clinical Variables: Effect on Mean Retinal Nerve Fiber Layer Thickness

Variable	Regression Coefficient	Standard Error	P Value	95% Confidence Interval
Age (per decade)	−1.99	0.41	<0.001	−2.79 to −1.19
Gender	1.25	1.29	0.332	−1.28 to 3.78
Ethnicity*
Hispanic	3.54	1.54	0.022	0.50–6.58
African	0.34	2.28	0.882	−4.15 to 4.83
Asian	7.88	3.88	0.043	0.25–15.5
Asian–Indian	2.99	6.29	0.635	−9.40 to 15.37
Eye	0.47	1.24	0.706	−1.96 to 2.90
Axial length (per mm)	−2.24	0.60	<0.001	−3.42 to −1.06
Disc area (per mm2)	3.34	1.28	0.010	0.81–5.86

^*Caucasian was used as the reference group.