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Table 3: Mean normalized volumes and MT ratios of the cerebral cortical GM in 15 healthy controls and 15 HD carriers
Lobes Mean Normalized Volume (mm³) Mean MT Ratio
Controls HD Carriers P Value^{^a} Controls HD Carriers P Value^{^a}
Frontal 202 ± 16 179 ± 19 <.01 55.1 ± 0.9 50.7 ± 3.5 <.001
Parietal 161 ± 15 135 ± 20 <.01 54.5 ± 0.8 51.4 ± 2.9 <.01
Temporal 143 ± 11 128 ± 13 .02 54.9 ± 0.8 51.7 ± 2.7 <.01
Occipital 91 ± 10 72 ± 10 <.01 53.2 ± 1.3 48.2 ± 3.4 <.01
a Mann-Whitney U test with Bonferroni correction.

Lobes	Mean Normalized Volume (mm³)			Mean MT Ratio
Lobes	Controls	HD Carriers	P Value^{^a}	Controls	HD Carriers	P Value^{^a}
Frontal	202 ± 16	179 ± 19	<.01	55.1 ± 0.9	50.7 ± 3.5	<.001
Parietal	161 ± 15	135 ± 20	<.01	54.5 ± 0.8	51.4 ± 2.9	<.01
Temporal	143 ± 11	128 ± 13	.02	54.9 ± 0.8	51.7 ± 2.7	<.01
Occipital	91 ± 10	72 ± 10	<.01	53.2 ± 1.3	48.2 ± 3.4	<.01