Table 1.

General information about the distribution of the links of the study networks.

Study group	CN	EMCI	LMCI	AD	p	F
The average strength of the links
Total strength	$9.35\pm 5.4$	$7.84\pm 4.9$	$7.77\pm 4.5$	$7.56\pm 3.8$	< 0.001	8.76
Long links	$0.0068\pm 0.0494$	$0.0050\pm 0.0443$	$0.0031\pm 0.0339$	$0.0029\pm 0.0323$	< 0.001	60.76
Short links	$0.0500\pm 0.1360$	$0.0519\pm 0.1488$	$0.0539\pm 0.1477$	$0.0541\pm 0.1506$	< 0.001	46.19
Inter-module links	$0.0022\pm 0.1031$	$0.0059\pm 0.0876$	$0.0092\pm 0.0861$	$0.0108\pm 0.1018$	< 0.001	146.3
Intra-module links	$0.1695\pm 0.1478$	$0.1493\pm 0.1274$	$0.1309\pm 0.1178$	$0.1218\pm 0.1314$	< 0.001	28.13

Pairwise comparison	CN-AD	EMCI-AD	LMCI-AD	CN-EMCI	CN-LMCI	EMCI-LMCI
The pairwise t-test comparison
Total strength	< 0.001	0.287	0.002	0.001	0.234	0.038
Long links	< 0.001	< 0.001	0.001	0.061	< 0.001	< 0.001
Short links	< 0.001	0.911	< 0.001	< 0.001	< 0.001	< 0.001
Inter-module links	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	0.054
Intra-module links	0.190	< 0.001	0.200	< 0.001	0.010	< 0.001

The top table shows the average strength of the links, which are grouped into long or short links and inter-module or intra-module links. The significance of the pairwise differences is assessed using the t-test and is shown in the bottom table.