Table 4.

Sensitivity, specificity, and area under the curve values identified by cut-off points of different posterior corneal parameter sets to differentiate eyes with suspect keratoconus from normal corneas and keratoconus from normal ones.

Indices	Cut-Off Value		ROC AUC		Sensitivity (%)		Specificity (%)
	Normal vs. SKC	Normal vs. KC	Normal vs. SKC	Normal vs. KC	Normal vs. SKC	Normal vs. KC	Normal vs. SKC	Normal vs. KC
Total HOAs	>0.33	>0.37	0.629	0.963	33.33	91.43	89.81	93.52
Trefoil Z (3, ±3)	>0.23	>0.25	0.588	0.93	30.95	84.29	88.89	91.67
Coma Z (3, ±1)	>0.03	>0.18	0.667	0.929	88.1	81.43	43.52	87.96
Spherical Z (4, 0)	≤0.05	≤−0.03	0.753	0.846	100	67.14	36.11	94.44

ROC AUC = receiver operating characteristic area under the curve; vs = versus; SKC = suspect keratoconus; KC = Keratoconus; HOAs = higher-order aberrations; Z = Zernike.