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Table 3: GM and WM mean MTR of the frontal, parietal, temporal, and occipital lobes
Lobe Tissue Normal Cognition (n = 43) MCI (n = 19) AD (n = 55)
Frontal GM 27.1 (±1.9) 26.0 (±2.0) 25.5 (±1.9)^a
WM 35.0 (±1.0) 34.5 (±1.3) 34.4 (±1.1)^a
Parietal GM 26.9 (±2.0) 26.2 (±1.7) 25.7 (±1.9)^a
WM 34.8 (±1.0) 34.6 (±1.3) 34.3 (±1.3)^a
Temporal GM 29.7 (±1.4) 28.9 (±1.3) 27.6 (±1.5)^a
WM 34.7 (±1.1) 34.5 (±1.2) 34.2 (±0.9)^a
Occipital GM 28.8 (±1.9) 29.1 (±1.5) 27.9 (±1.9)^a
WM 33.8 (±0.9) 33.8 (±1.1) 33.4 (±1.1)
Note:—Data are represented as mean (± SD).
a Differs from the group with normal cognition (P < .01).

Lobe	Tissue	Normal Cognition (n = 43)	MCI (n = 19)	AD (n = 55)
Frontal	GM	27.1 (±1.9)	26.0 (±2.0)	25.5 (±1.9)^a
	WM	35.0 (±1.0)	34.5 (±1.3)	34.4 (±1.1)^a
Parietal	GM	26.9 (±2.0)	26.2 (±1.7)	25.7 (±1.9)^a
	WM	34.8 (±1.0)	34.6 (±1.3)	34.3 (±1.3)^a
Temporal	GM	29.7 (±1.4)	28.9 (±1.3)	27.6 (±1.5)^a
	WM	34.7 (±1.1)	34.5 (±1.2)	34.2 (±0.9)^a
Occipital	GM	28.8 (±1.9)	29.1 (±1.5)	27.9 (±1.9)^a
	WM	33.8 (±0.9)	33.8 (±1.1)	33.4 (±1.1)