Table 3.

Individual centrality and network centralization of GP research from 1999–2014

Centralization		1999 to 2003	2004 to 2008	2009 to 2014
Degree	Mean ± SD	266.00 ± 417.66	290.05 ± 516.42	300.56 ± 477.66
	Min	66.00	54.00	62.00
	Max	2160.00	3239.00	2561.00
Betweenness	Mean ± SD	3.93 ± 3.54	7.54 ± 7.27	14.19 ± 16.86
	Min	0.37	0.87	0.69
	Max	11.15	25.87	59.90
Closeness	Mean ± SD	33.85 ± 4.55	55.07 ± 7.08	91.38 ± 12.53
	Min	26.00	40.00	63.00
	Max	41.00	65.00	111.00
Network Centralization (%)		19.77	19.09	13.04

Note: Min Minimum value, Max Maximum value, SD Standard Deviation