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Table 2: Three 1D classifiers and three 2D classifiers with the highest Youden index, for the binary classification with group 1: NPH; and group 2: AD^{^a}
f_CSF f_brain θ (f_CSF, θ) (σ_brain, θ) (f_mix, θ)
Sensitivity 0.73 (11/15) 1.00 (15/15) 0.73 (11/15) 0.73 (11/15) 0.73 0.87 (13/15)
Specificity 0.56 (5/9) 0.33 (3/9) 0.78 (7/9) 0.89 (8/9) 0.92 0.89 (8/9)
Y-index 1.29 1.33 1.51 1.62 1.65 1.76
↵a The numbers in parentheses represent the numerators and denominators for the given fractional values.

	f_CSF	f_brain	θ	(f_CSF, θ)	(σ_brain, θ)	(f_mix, θ)
Sensitivity	0.73 (11/15)	1.00 (15/15)	0.73 (11/15)	0.73 (11/15)	0.73	0.87 (13/15)
Specificity	0.56 (5/9)	0.33 (3/9)	0.78 (7/9)	0.89 (8/9)	0.92	0.89 (8/9)
Y-index	1.29	1.33	1.51	1.62	1.65	1.76