Structural Brain Imaging Phenotypes of Mild Cognitive Impairment (MCI) and Alzheimer’s Disease (AD) Found by Hierarchical Clustering

Table 2

APOE ε4 data and baseline diagnoses of the subjects. The baseline diagnosis depends on the number of APOE alleles (chi-squared test ).

	Mean ADAS score at baseline	ADAS score std at baseline	No APOE	APOE heterozygotes	APOE homozygotes
NC	9.4	4.3	311	106	11	428
MCI	16.6	6.8	381	290	80	751
AD	29.8	8.0	94	130	58	282
Σ	—	—	786	526	149	1461