Table 6. The AUCs (areas under the curves) analyzed by receiver operating characteristics (ROC) curves.

Diagnosis (or Differential Diagnosis)	Area under the ROC curve (AUC)	Statistical Significance (p)	Asymptotic 95% Confidence Interval
			Lower Bound	Upper Bound
DD:. Healthy or abnormalities of the ocular surface †	0.98	P <0.001	0.00	1.00
ATD	0.78	p<0.001	0.68	0.88
MGDs	0.66	p  = 0.013	0.53	0.78
DD:. ATD or MGDs	0.67	p  = 0.025	0.54	0.81
By applying the TDI (cutoff  =  1.35) in the	1.00	p <0.001	1.00	1.00
DD between ATD from MGDs

^†In this case, no abnormalities of the ocular surface (ATD + MGDs)  =  positive diagnosis.

DD =  differential diagnosis. ATD  =  aqueous tear deficiency; obstructive MGD  =  (obvious) obstructive meibomian gland dysfunction; NOMGD  =  non-obvious obstructive meibomian gland dysfunction; MGDs  =  obstructive MGD or NOMGD; ROC curves  =  (receiver operating characteristics) curves.