Table 1.

Refraction and demographic data of the two groups ($\overline{x}$±s/ M)

	Group A	Group B	t / Z	P
Age (years)	27.62±6.25	26.24±7.02	1.597	0.111
SE(D)	−6.36±2.04	−6.47±2.26	0.617	0.535
Cyl(D)	−0.75 (0~ − 3.25)	−0.75 (0~ − 4.25)	2.143	0.062
AD (μm)	92.06±21.02	94.71±22.20	−1.43	0.153

SE spherical equivalent, Cyl cylinder, AD excimer laser ablation depth