Table 2.

Mean corneal thickness at the 6–mm optical zone preoperation, at 1 week postoperation and 12 months postoperation in the two study groups

Mean corneal thickness at the 6-mm optical zone (μm)	Group A (mean ± SD)	Group B (mean ± SD)	p-value
Preoperative	553.8 ± 11.8	551.3 ± 11.5	0.0671
1 week postop.	513.4 ± 16.2	506 ± 15.4	0.0021 *
12 months postop.	520.6 ± 15.4	517.4 ± 13.9	0.1501*
P -value	<  0.001 2*	<  0.001 2*

¹Student’s t test; ²Mann-Whitney U test; ³Friedman test;

*Statistically significant at p < 0.05