Table 4. Time dependence of central endothelial cell density recovery after different CXL treatments.

Days	Control cells/mm2	CXL-2.16 cells/mm2	CXL-2.7 cells/mm2	CXL-3.24 cells/mm2
1	2706 ± 44	2679 ± 51	2220 ± 83**	0***
7	2718 ± 36	2703 ± 44	2282 ± 47**	0***
14	2740 ± 57	2734 ± 32	2378 ± 31**	327 ± 43***
28	2719 ± 41	2732 ± 45	2656 ± 49	1217 ± 33**
42	2735 ± 37	2746 ± 38	2723 ± 36	1753 ± 57**

SEM, standard error of the mean.

**p < 0.01

***p < 0.001 compare to control group.