Aberrant topology of the default mode network is associated with phosphatidylcholine and triglyceride levels in major depressive disorder

Table 1 Introduction of nodal metrics and their meaning in the brain structural network

Nodal metrics	Meaning
Betweenness centrality	The extent to which a node controls information flow by lying on shortest paths between other node pairs in the network
Degree centrality	The number of edges directly connected to a node
Clustering coefficient	The density of connections among a node’s immediate neighbors
Efficiency	The ability of a node to propagate information with the other nodes in a network
Local efficiency	The robustness of information transfer within the immediate neighborhood of a node upon its removal
Shortest path length	The minimum number of edges required to traverse between two nodes