Table 1. Corneal Epithelium Thickness in the central (2-mm diameter), para-central (2 to 5- mm diameter), and peripheral (5 to 6-mm diameter) in right and left eyes of 614 normal Chinese children.

	Right Eye		Left Eye		Correlation Coefficienta	Wilcoxon Signed Rank Testb
	Mean (μm)	SD	Mean (μm)	SD		P value
Center	53.58	2.84	53.71	2.89	0.87	0.023
Superior (2–5 mm)	52.16	2.70	52.18	2.78	0.80	0.772
Superior (6 mm)	50.80	3.03	50.70	3.17	0.67	0.376
Superior Temporal (2–5 mm)	52.12	2.78	52.22	2.83	0.84	0.067
Superior Temporal (6 mm)	51.47	2.74	51.49	3.11	0.73	0.832
Temporal (2–5 mm)	52.43	2.91	52.55	2.89	0.84	0.096
Temporal (6 mm)	52.07	2.82	52.22	2.87	0.78	0.050
Inferior Temporal (2–5 mm)	53.41	2.94	53.37	2.92	0.85	0.261
Inferior Temporal (6 mm)	53.44	2.98	53.36	2.96	0.82	0.119
Inferior (2–5 mm)	54.15	2.90	54.27	2.92	0.85	0.045
Inferior (6 mm)	54.33	2.97	54.42	2.99	0.85	0.260
Inferior Nasal (2–5 mm)	54.08	2.71	54.36	2.85	0.85	<0.001
Inferior Nasal (6 mm)	54.01	2.72	54.32	2.78	0.84	<0.001
Nasal (2–5 mm)	53.60	2.65	53.72	2.76	0.85	0.021
Nasal (6 mm)	53.55	2.56	53.62	2.71	0.83	0.294
Superior Nasal (2–5 mm)	52.87	2.67	52.98	2.78	0.84	0.089
Superior Nasal (6 mm)	52.28	2.79	52.33	2.79	0.73	0.419

^aSpearman’s Rank Correlation Coefficient was used to evaluate the correlations of corneal epithelium thickness in various zones between right and left eyes of 614 normal Chinese children. All P < 0.001.

^bWilcoxon Signed Rank Test was used to test the differences of corneal epithelium thickness in various zones between right and left eyes of 614 normal Chinese children.