Table 2. Correlation coefficient matrix of six network properties.

	In-degree	Out-degree	Closeness centrality	Betweenness centrality	Eigenvector centrality	PageRank
In-degree	1
Out-degree	.442**	1
Closeness centrality	.286**	.279**	1
Betweenness centrality	.557**	.732**	.177**	1
Eigenvector centrality	.975**	.424**	.322**	.509**	1
PageRank	.941**	.494**	.265**	.648**	.917**	1

Notes.

^**Correlation is significant at the 0.01 level.

^*Correlation is significant at the 0.05 level.