Table 4.

Results of the multivariate analysis of corneal endothelial parameters.

Objective variable	Explanatory variable	Partial regression coefficient	Standardized partial regression coefficient	P-value
ECD	Usage period of hard contact lens (years)	−1.07	−0.029	0.07
	Sex (Male)	−3.55	−0.0042	< 0.001
	Age (years)	−10.69	−0.32	< 0.001
	Constant values	3304.91	–	–
CV	Usage period of hard contact lens (years)	0.16	0.21	< 0.001
	Sex (Male)	0.40	0.022	0.04
	Age (years)	0.092	0.13	< 0.001
	Constant values	27.65	–	–
6A	Usage period of hard contact lens (years)	−0.18	−0.15	< 0.001
	Sex (Male)	−0.37	−0.014	0.21
	Age (years)	−0.097	−0.093	< 0.001
	Constant values	63.04	–	–

ECD endothelial cell density; CV coefficient of variation of the cell area; 6A rate of appearance of hexagonal cells.