Table 3.

Characteristics of the National Patient Safety Partnership Network: Comparative Statistics 2004 and 2006

	Consistent Sample*
Network Statistic	2006	2004	2006
Total number of organizations reported in the network†	147	92	110
Number of isolates	5	4	3
Number of components	1	5	1
Density‡	0.053	0.067	0.092
Transitivity (percentage)‡	17.39	11.36	24.44
Network centralization (percentage)‡	30.99	20.94	24.51

^*Based on the 35 organizations interviewed in both 2004 and 2006.

^†Includes both interviewed organizations and their reported partner organizations.

^‡Calculated only on partnerships among interviewed organizations.