Table 1. Properties of the DSM-IV giant component.

Global properties
Number of symptoms	208
Number of explicitly represented disorders	69
Number of edges	1949
Average shortest path length	2.60
Average number of shortest paths between two symptoms	3.01
Small-worldness index (SWI), based on transitivity	6.20
Clustering coefficient, based on transitivity	0.68
Average degree	18.74