Table 3:

Virtual crossmatch for deceased donor kidney transplants among the United Network for Organ Sharing regions and among centers stratified by annual deceased donor transplant volumes before and after the implementation of 2014 kidney allocation system

UNOS Region	Pre-KAS		Post-KAS		VXM (post-KAS vs pre-KAS)
	Total DDKT	VXM, N (%)	Total DDKT	VXM, N (%)	Change in VXM (%p)	OR for VXM	P value
1	1,161	91 (7.8%)	1,853	213 (11.5%)	+3.7%	1.5 (1.2, 2.0)	0.001
2	4,048	83 (2.1%)	6,283	331 (5.3%)	+3.2%	2.7(2.1,3.4)	<.001
3	4,422	401 (9.1%)	7,189	1,030 (14.3%)	+5.3%	1.7(1.5,1.9)	<.001
4	2,719	112 (4.1%)	5,027	218 (4.3%)	+0.2%	1.1(0.8,1.3)	0.6
5	5,427	1,739 (32.0%)	8,164	3,173 (38.9%)	+6.8%	1.3(1.3,1.4)	<.001
6	1,285	10 (0.8%)	1,918	12 (0.6%)	−0.2%	0.8 (0.4,1.8)	0.6
7	2,166	288 (13.3%)	3,523	541 (15.4%)	+2.1%	1.2 (1.0,1.4)	0.03
8	2,285	36 (1.6%)	3,321	283 (8.5%)	+6.9%	5.8 (4.1, 8.3)	<.001
9	2,061	28 (1.4%)	3,317	216 (6.5%)	+5.2%	5.1 (3.4, 7.5)	<.001
10	2,611	48 (1.8%)	3,966	73 (1.8%)	+0.0%	1.0 (0.7,1.4)	0.9
11	3,465	247 (7.1%)	5,260	459 (8.7%)	+1.6%	1.2(1.1,1.5)	0.007
Transplant center volumes (DDKT/year)
Ql (≤22), n = 54	1,236	87 (7.0%)	2,081	152 (7.3%)	+0.3%	1.0 (0.8,1.4)	0.8
Q2 (23–46), n =55	4,609	326(7.1%)	6,921	570 (8.2%)	+1.1%	1.2 (1.0,1.4)	0.02
Q3 (47–79), n = 55	7,505	483 (6.4%)	13,133	1,119 (8.5%)	+2.1%	1.4(1.2,1.5)	<.001
Q4 (≥80), n = 55	18,300	2,187 (12.0%)	27,686	4,708 (17.0%)	+5.0%	1.5 (1.4,1.6)	<.001
Total	31,650	3,083 (9.7%)	49,821	6,549 (13.1%)	+3.4%	1.35 (1.3,1.41)	<.001

DDKT: Deceased donor kidney transplantation; KAS: Kidney allocation system, VXM: Virtual crossmatch.