Table 2 Comparison of myopia group and central corneal thickness (CCT) group.

	Compared groups	Number	Mean (SD)	Range	p Value
	Myopia groups		CCT μm
1	0 to –4 D	258	536.6 (42.7)	305–684	0.48*?
2	>–4 to –8 D	349	531 (35.5)	417–613	0.04*
3	>–8 D*	107	540.9 (33.7)	417–614	NA
	CCT groups		Myopia (D)
1	<500 μm	112	−5.1 (2.5)	−0.75––13.37	0.52
2	500 to <550 μm	345	−5.3 (2.6)	−1––15.25
3	550 to 600 μm	237	−5.5 (3)	−0.75––17.5
4	>600 μm	20	−4.7 (2.9)	−0.63––9.88

*The group compared with the other groups in the Dunnett t test (two sided). †Overall significance level was p = 0.04.