Table 3. Associated factors for the corneal epithelium thickness in the central (2-mm diameter), para-central (2 to 5-mm diameter), and peripheral (5 to 6-mm diameter) cornea by multiple regression analysis (n = 370, data from right eyes).

Dependent Variable	Independent Variables Included in Equation	Beta Coefficient	95% CI of Beta Coefficient	P Value
Center	Gender	−0.73	−1.28 to −0.18	0.009
	Age	0.14	0.01 to 0.27	0.037
Superior (2–5 mm)	CCR	1.86	0.84 to 2.88	<0.001
	Gender	−0.71	−1.25 to −0.17	0.010
Superior (6 mm)	CCR	2.60	1.52 to 3.69	<0.001
	Age	−0.14	−0.27 to −0.00	0.048
Superior Temporal (2–5 mm)	Gender	−1.03	−1.58 to −0.49	<0.001
	Age	0.22	0.10 to 0.34	0.001
	CCR	1.35	0.32 to 2.37	0.010
Superior Temporal (6mm)	Gender	−0.76	−1.31 to −0.22	0.006
	CCR	1.73	0.71 to 2.76	0.001
	Age	0.17	0.05to 0.29	0.007
Temporal (2–5 mm)	Age	0.29	0.16 to 0.42	<0.001
	Gender	−0.86	−1.43 to −0.30	0.003
	CCR	1.23	0.16 to 2.30	0.024
Temporal (6 mm)	Age	0.30	0.18 to 0.43	<0.001
	Gender	−0.85	−1.41 to −0.29	0.003
	CCR	1.53	0.47 to 2.58	0.005
Inferior Temporal (2–5 mm)	Age	0.30	0.17 to 0.43	<0.001
	CCR	1.69	0.62 to 2.75	0.002
Inferior Temporal (6 mm)	Age	0.33	0.19 to 0.47	<0.001
	CCR	1.92	0.81 to 3.02	0.001
Inferior (2–5 mm)	Age	0.25	0.12 to 0.39	<0.001
	CCR	1.52	0.44 to 2.60	0.006
Inferior (6 mm)	Age	0.29	0.15 to 0.42	<0.001
	CCR	1.95	0.85 to 3.06	0.001
Inferior Nasal (2–5 mm)	Age	0.25	0.12 to 0.37	<0.001
	CCR	1.95	0.92 to 2.97	<0.001
Inferior Nasal (6 mm)	CCR	2.15	1.11 to 3.19	<0.001
	Age	0.26	0.13 to 0.39	<0.001
Nasal (2–5 mm)	Age	0.25	0.12 to 0.37	<0.001
	CCR	1.56	0.54 to 2.56	0.003
	Gender	−0.69	−1.23 to −0.15	0.013
Nasal (6 mm)	CCR	1.93	0.94 to 2.92	<0.001
	Age	0.24	0.12 to 0.36	<0.001
	Gender	−0.70	−1.22 to −0.17	0.010
Superior Nasal (2–5 mm)	CCR	1.72	0.71 to 2.73	0.001
	Gender	−0.73	−1.27 to −0.20	0.008
	Age	0.12	0.00 to 0.24	0.050
Superior Nasal (6 mm)	CCR	2.77	1.74 to 3.79	<0.001

CCR: corneal curvature radius.

CI: confidence interval.