Table 3:

At the maximum AUC, thresholds, sensitivity, specificity, and age-adjusted OR (95% CI) for the tap-positive compared with the tap-negative group

Tap-Positive vs Tap-Negative	AUC	Optimal Threshold	Sensitivity	Specificity	OR (95% CI)	P Valuea
Total ventricle volume (mL)	0.657	155	58.3	80.0	1.49 (1.13–1.96)	.004
Total ventricle volume ratio (%)	0.700	8.6	79.2	56.0	1.49 (1.13–1.96)	.005
Bilateral ventricle volume (mL)	0.657	147	54.2	84	1.52 (1.15–2.07)	.003
Bilateral ventricle volume ratio (%)b	0.705	7.9	83.3	56.0	1.40 (1.06–1.84)	.019
Total subarachnoid space volume (mL)b	0.714	312	87.5	48.0	0.66 (0.49–0.89)	.006
Total subarachnoid space volume ratio (%)	0.682	17.9	75.0	72.0	0.63 (0.48–0.82)	<.001
CSF volume of frontal convexity (mL)b	0.701	45.9	79.2	76.0	0.58 (0.45–0.74)	<.001
CSF volume of parietal convexity (mL)b	0.768	37.9	91.7	52.0	0.60 (0.45–0.79)	<.001
CSF volume of Sylvian fissure and basal cistern (mL)	0.648	137	75.0	56.0	0.71 (0.52–0.96)	.028
CSF volume of posterior fossa (mL)	0.500	78.7	16.7	96.0	1.41 (0.89–2.25)	.146
Upper-to-lower subarachnoid space ratiob	0.723	0.33	45.8	92.0	0.62 (0.46–0.83)	.002
Evans Index	0.683	0.33	58.3	80.0	1.37 (1.04–1.80)	.026
Y-Evans Index	0.662	0.24	41.7	92.0	1.42 (0.99–2.03)	.057
Z-Evans Indexb	0.758	0.42	66.7	88.0	1.74 (1.35–2.24)	<.001
X-Max Index	0.640	0.62	70.8	60.0	1.55 (1.12–2.16)	.009
Y-Max Index	0.665	0.69	45.8	92.0	1.69 (1.26–2.27)	<.001
Z-Max Index	0.543	0.74	58.3	60.0	1.13 (0.85–1.52)	.401
Callosal angle (degree)	0.632	77.3	87.5	48.0	1.51 (1.13–2.02)	.005

^aProbability value for the age-adjusted ORs in a logistic regression model.

^bRows in which the AUC > 0.7 and P <. 05 are at the optimal threshold.