Table 3.

ROC curve analysis for the ability of Scheimpflug parameters to differentiate keratoconus eye from control

parameter	AUC	SE	95% CI	P value	cutoff	Sensitivity	specificity
Ks	0.96	0.025	0,1	< 0.001	43.6	95%	90%
Kf	0.65	0.3	0.4,0.8	0.054	41.7	70%	55%
Km	0.94	0.089	0.8,1	< 0.001	42.9	75%	90%
CCT	0.65	0.081	0.052	< 0.001	524	65%	71%
CT min	0.81	0.060	0.96,0.93	< 0.001	516	90%	82%
PE	0.95	0.029	0,1	< 0.001	9.5	90%	95%
BDE	0.87	0.053	0.77,0.97	< 0.001	12.5	70%	98%
PPI avg	0.93	0.034	0.8,1	< 0.001	1.2	80%	95%
PPI max	0.98	0.011	0,1	< 0.001	1.5	100%	95%
ART avg	0.94	0.036	0.83,1	< 0.001	368	80%	98%
ART min	0.88	0.051	0.78,0.98	< 0.001	568	75%	80%
ART max	0.85	0.055	0.74,0.96	< 0.001	330	100%	82%
D index	0.99	0.007	0,1	< 0.001	2.07	100%	95%

ART Ambrosio relational thickness, AUC area under curve, avg. average, BDE back difference elevation, CCT central corneal thickness, CI confidence interval, CTmin minimum corneal thickness, D index multimetric D, Kf flat keratometry, Km mean keratometry, Ks steep keratometry, max maximum, min minimum, NA not applicable,SE standard error,PE posterior elevation, PPI pachymetric progression index