Table 4.

Classification results of patients with stages 1 (n=40) and 2 keratoconus (n=53) on the testing sets

Stage 1 versus stage 2	Accuracy	Sensitivity	Specificity	AUC
Axial map	0.5699 (0.4839 to 0.6559)	1.0 (1.0 to 1.0)	0.0 (0.0 to 0.0)	5.0 (5.0 to 5.0)
Thickness map	0.8925 (0.8387 to 0.9462)	0.9245 (0.8571 to 0.9808)	0.85 (0.75 to 0.9429)	0.8873 (0.8281 to 0.9383)
Front elevation map	0.7957 (0.7204 to 0.8602)	0.8302 (0.74 to 0.913)	0.75 (0.6316 to 0.8571)	0.7901 (0.7178 to 0.8592)
Back elevation map	0.914 (0.8602 to 0.9570)	0.9057 (0.8276 to 0.9636)	0.925 (0.8462 to 0.9796)	0.9153 (0.8618 to 0.9592)
Concatenated	0.9032 (0.8495 to 0.9462)	0.9245 (0.86 to 0.9811)	0.875 (0.7805 to 0.9535)	0.8998 (0.8423 to 0.9505)
Majority voting	0.914 (0.8602 to 0.957)	0.9434 (0.8837 to 1.0)	0.875 (0.7812 to 0.9535)	0.9092 (0.8557 to 0.9569)

95% CI in brackets.

AUC, area under the curve.