Table 2.

Sensitivity and Specificity Data, With 95% Confidence Intervals Displayed in Brackets

	Overall	Cluster 1	Cluster 2	Cluster 3
All data
Sensitivity
Drasdo displacement	0.77 (0.75–0.80)	0.79 (0.75–0.83)	0.77 (0.74–0.79)	N/A
No displacement	0.76 (0.75–0.78)	0.79 (0.74–0.83)	0.76 (0.74–0.79)	0.67 (0.58–0.77)
Specificity
Drasdo displacement	0.59 (0.58–0.60)	0.59 (0.58–0.61)	0.58 (0.56–0.59)*	N/A
No displacement	0.61 (0.60–0.61)	0.61 (0.59–0.63)	0.61 (0.60–0.62)*	0.39 (0.32–0.46)
Only shared locations
Sensitivity
Drasdo displacement	0.78 (0.75–0.80)	0.81 (0.76–0.85)	0.77 (0.74–0.79)	N/A
No displacement	0.78 (0.76–0.81)	0.79 (0.74–0.83)	0.78 (0.75–0.81)	N/A
Specificity
Drasdo displacement	0.58 (0.57–0.59)*	0.59 (0.57–0.61)	0.58 (0.56–0.59)	N/A
No displacement	0.61 (0.59–0.62)*	0.61 (0.59–0.63)	0.60 (0.59–0.62)	N/A

*Asterisks indicated paired comparisons between Drasdo and no displacement where 95% confidence intervals do not overlap, that is a significant difference in values exist between methods. Clusters refer to VF clusters per Choi et al.,²² with cluster 1 being the most central and cluster 3 being most peripheral. As fewer peripheral points fell within the Ganglion Cell Analysis elliptical annulus with Drasdo displacement, no locations fell within cluster 3, and therefore comparisons with no displacement could not be performed.

N/A, not applicable.