Table 5. Diagnostic performance of GSDI at different glaucoma stages.

Stage	# of cases	AUC*	Sensitivity at 99% specificity (%)	Sensitivity at 95% specificity (%)
<1	6	0.840	33.3	66.7
1	90	0.874	44.9	60.7
2	47	0.910	67.4	78.3
3	45	0.999	97.6	100.0
4–5	48	0.999	98.1	100.0

^*The AUC, sensitivity and specificity for GSDI were calculated using leave-one-out cross-validation.

AUC, area under the receiver operator characteristic curve; GSDI, glaucoma structural diagnostic index.