Analyzing Knowledge Retrieval Impairments Associated with Alzheimer’s Disease Using Network Analyses

Table 2

Summary statistics for both PAD an NC networks, as well as mock PAD and NC networks. A dashed line indicates no difference between the mock networks and nonmock statistic. Average shortest-path length and diameter were computed on the largest component of each network, as they are undefined on networks with multiple components.

	NC		PAD
Number of networks	84	—	41	—
Number of lists	9.51	—	6.05	—
Number of items listed	19.3	—	13.1	—
Number of nodes	66.8	—	32.3	—
Mini-mental state exam (MMSE)	29.2	—	22.4	—
Diameter	9.55	7.12	7.61	6.37
Density	.06	.07	.12	.13
Mean node degree	3.55	4.37	3.18	3.44
Median node degree	2.55	2.93	2.37	2.51
Average shortest-path length	3.74	3.07	3.25	2.89
Clustering coefficient	.12	.15	.14	.17
Perseveration rate	.034	—	.127	—
Perseveration parameter ()	.071	.097	.345	.304
Small-world coefficient	1.92	2.05	1.21	1.36