Table 2.

Comparison of tensile stiffness (K[ts]) derived from load to extension plot. Significance is marked in italics

	N	K[ts] at 0.15 mm	K[ts] at 0.29 mm	K[ts] at 0.44 mm	K[ts] at 0.58 mm	K[ts] at 0.72 mm
Controls	18	231.2 ± 113.1	425.3 ± 198.7	650.6 ± 282.8	936.0 ± 428.6	1164.5 ± 533.3
S-CXL (3*30)	18	828.6 ± 512.8	1440.5 ± 875.6	1958.9 ± 1062.1	2135.3 ± 997.2	1975.9 ± 803.8
P value (S-CXL (3*30) − controls)		< 0.001	< 0.001	< 0.001	< 0.001	0.03
A-CXL (9*10)	18	472.7 ± 346.1	896.0 ± 403.7	1264.6 ± 574.9	1676.4 ± 624.8	1747.7 ± 637.3
P value (A-CXL (9*10)  − controls)		0.204	0.052	0.046	0.011	0.062
P value (A-CXL (9*10) − S-CXL (3*30))		0.013	0.016	0.017	0.285	1.0
A-CXL (18*5)	18	489.2 ± 228.9	823.5 ± 352.2	1325.9 ± 512.2	1706.1 ± 539.4	1838.1 ± 650.0
P value (A-CXL (18*5) − controls)		0.143	0.152	0.021	0.007	0.020
P value (A-CXL (18*5) − S-CXL (3*30))		0.020	0.004	0.037	0.379	1.0
P value (A-CXL (18*5) − A-CXL (9*10))		1.0	1.0	1.0	1.0	1.0

A-CXL accelerated CXL, CXL corneal cross-linking, K[ts] tensile stiffness in (N/m), S-CXL standard CXL