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. Author manuscript; available in PMC: 2009 Sep 15.
Published in final edited form as: Neurology. 2003 Aug 26;61(4):500–506. doi: 10.1212/01.wnl.0000079052.01016.78

Table 2.

Area under the fMRI ROC curve by clinical group and activation task

Task Normal Elderly (n = 11) MCI (n = 9) AD (n = 9)
Memory* 3.9 (3.3, 4.4) 2.4 (1.9, 3.0) 2.6 (1.6, 3.7)
Sensory 5.5 (3.0, 5.7) 3.5 (3.3, 5.4) 7.6 (6.0, 10.0)
*

p < .05

Values in the table are median and interquartile range, expressed as area × 10−3. Since the TPF and 1-FPF are proportions, they are unitless and the area under the curve (AUC) is also unitless. Pairwise comparisons were completed between each clinical group for both tasks. There was a significant difference between the Normals and MCIs (Rank Sum Test one-sided p = .03) and Normals and ADs (Rank Sum Test one-sided p = .04) for the memory task, but not between the MCIs and ADs. The difference between the groups on the sensory task was not significant.