Table 1. Baseline data of children in Ortho-k group and spectacle group.

Groups	Case	Age (y)	Gender (Male/Female)	SER (diopter)
Ortho-k	37	11.2±1.9	14/23	-3.3±1.2
SVL	35	11.6±1.9	18/17	-3.0±1.1
t/χ2	-	-0.8a	1.3b	-1.1a
P	-	0.4	0.2	0.3

Ortho-k: Otrthokeratology; SVL: Single-vision spectacle lens; SER: Spherical equivalent refractive error. ^at test for two independent samples; ^bχ² test.