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Table 2: 
Interobserver averaged hippocampal sulcus (HS) width (fimbriosubicular distance) according to grade of medial temporal lobe atrophy (MTA) in patients with Alzheimer disease (AD) (n = 21) and nondemented elderly control subjects (n = 15)
MTA scoreMean HS Width in mm (SD)P Value
AD PatientsControl Subjects
0 (n = 3)1.4 (0.5)
1 (n = 18)2.1 (0.5)1.3 (0.7)P < 0.05
2 (n = 6)2.5 (0.1)1.7 (0.4)P < 0.05
3 (n = 6)3.5 (0.4)
4 (n = 3)4.1 (1.1)