Matched pair analysis of the effect of longer hypothermic machine perfusion time on kidney transplant outcomes

Table 2 Donor kidney factors for paired kidneys transplanted first (kidney 1 group) and second (kidney 2 group, with longer hypothermic machine perfusion time)

Factor	Received kidney 1 (n = 61)	Received kidney 2 (n = 61)	P value
DCDD (%)	42 (69)	42 (69)	1.0
ECD (%)	19 (31)	19 (31)	1.0
HMP time (HR, 95%CI)	5.2 (4.5, 5.8)	10.8 (9.9, 11.7)	< 0.0001b
Static cold storage time (HR, 95%CI)	3.7 (3.1, 4.3)	3.9 (3.1, 4.7)	0.38
Total CIT (HR, 95%CI)	8.9 (7.9, 9.8)	14.7 (13.7, 15.8)	< 0.0001b
WIT2 (min, 95%CI)	52 (47, 57)	53(48, 59)	0.81

^bP < 0.01.

ECD: Expanded criteria donation; CIT: Cold ischemic time; DCDD: Donation after circulatory determination of death; HMP: Hypothermic machine perfusion; WIT2: Warm ischemic time at the time of anastomosis; CI: Confidence interval.