Table 4.

Difference in Mean Degree Centrality Between Participants and Nonparticipants by Collaboration Type and Year

	Year	Participant	Nonparticipant	Difference	Two-tailed T-Test
YVP Composite	Y1	46.5	25.3	21.3	0.001
	Y2	49.6	32.7	16.9	0.001
	Y3	46.5	33.0	13.5	0.01
	Y4	34.6	29.8	4.8	ns
	Y5	37.3	16.4	20.9	0.001
Advocacy &Policy	Y1	5.6	3.5	2.1	ns
	Y2	1.2	0.8	0.4	ns
	Y3	15.3	7.5	7.7	0.01
	Y4	7.3	5.6	1.7	ns
	Y5	2.0	0.7	1.3	0.1
Information Sharing	Y1	25.2	13.0	12.2	0.001
	Y2	33.5	16.0	17.5	0.001
	Y3	35.7	20.4	15.3	0.01
	Y4	25.7	25.1	0.7	ns
	Y5	22.2	7.5	14.7	0.001
Program & Service Delivery	Y1	14.1	9.0	5.1	0.05
	Y2	2.7	2.0	0.7	ns
	Y3	27.7	21.4	6.3	ns
	Y4	16.2	15.0	1.2	ns
	Y5	4.2	2.1	2.1	0.01
Resource Sharing	Y1	19.5	10.6	9.0	0.001
	Y2	2.2	1.6	0.6	ns
	Y3	23.9	14.2	9.7	0.01
	Y4	12.2	14.0	−1.8	ns
	Y5	12.1	5.4	6.6	0.001
Training & Education	Y1	8.132	4.96	3.2	0.05
	Y2	1.8	1.1	0.6	ns
	Y3	24.3	14.2	10.1	0.01
	Y4	16.4	12.4	3.9	ns
	Y5	12.9	4.4	8.5	ns