. Author manuscript; available in PMC: 2009 Aug 21.

Published in final edited form as: Brain. 2008 Feb 7;131(Pt 3):665–680. doi: 10.1093/brain/awm336

Table 5.

Paired group-wise differences for imaging measures

Marker	CN vs. aMCI	CN vs. AD	aMCI vs. AD
Global PiB
P-value^a	0.17	<0.001	0.004
Difference in medians (95% CI)	−0.39 (−0.51 to 0.05)	−0.99 (−1.06 to −0.53)	−0.59 (−0.99 to −0.32)
AUC (95% CI)	0.64 (0.45 to 0.82)	0.91 (0.79 to 1.00)	0.85 (0.69 to 1.00)
Hippocampal volume W score
P-value^a	0.009	<0.001	<0.001
Difference in medians (95% CI)	0.89 (0.25 to 1.62)	2.68 (2.06 to 3.11)	1.79 (0.94 to 2.41)
AUC (95% CI)	0.75 (0.59 to 0.91)	0.98 (0.94 to 1.00)	0.93 (0.83 to 1.00)

AUC, area under the receiver operating characteristic (ROC) curve

Two-sided, two-sample Wilcoxon rank-sum