Table 2 Correlations between epithelial, keratocyte, and endothelial cell densities and sub-basal nerve fibre innervation density with increasing age (Pearson’s correlation)

	Correlation*	p Value*
Basal epithelial density (cells/mm²)	0.200	0.067
Sub-basal nerve fibre density (mm/mm2)	−0.488	<0.001
Anterior keratocyte density (cells/mm²)	−0.423	<0.001
Mid keratocyte density (cells/mm²)	−0.237	0.029
Posterior keratocyte density (cells/mm²)	−0.250	0.021
Endothelial density (cells/mm²)	−0.615	<0.001

(n = 85 corneas)