Table 4.

β‐coefficients and their 95% confidence intervals showing the difference in central endothelial cell density (ECD) (cells/mm²) loss for different tube corneal (TC) distances

Parameter	Estimate	Sig.	95% Confidence interval
			Lower bound	Upper bound
Intercept (cells/mm2)	2229	<0.001	1988	2470
β 1, the effect of time after a follow‐up of t months	−15.7	<0.001	−20.8	−10.5
β 2, the effect of TC distance	−142.5	0.008	−246.8	−38.2
β 3, the interaction effect	4.51	0.004	1.46	7.55