Table 2.

Logistic regression for predictors of discard in ECD kidneys recovered between 2002 and 2012

Variables (reference)	Univariate		Multivariable1
	OR (95% CI)	p-Value	OR (95% CI)	p-Value
Pretransplant biopsy (No)	1.25 (1.09–1.43)	0.001	1.07 (0.93–1.24)	0.330
Fulfilling UNOS-DKT criteria (No)	2.28 (2.07–2.52)	<0.001	1.73 (1.54–1.93)	<0.001
KDPI %2 (corresponding KDRI-UNOS categories)
<80% (<1.7)	Referent	–	Referent	–
≥80% and ≤90% (≥1.7 and ≤2.0)	1.41 (1.25–1.60)	<0.001	1.17 (1.03–1.33)	0.018
>90% (>2.0)	2.81 (2.50–3.17)	<0.001	1.99 (1.74–2.29)	<0.001
Transplant center volume 100 kidney transplants/year (<100/year)	1.06 (0.97–1.18)	0.192	1.03 (0.93–1.15)	0.553
OPTN regions
Region 1	Referent	–	Referent	–
Region 2	1.24 (0.96–1.61)	0.103	1.20 (0.92–1.56)	0.182
Region 3	0.94 (0.71–1.24)	0.652	1.00 (0.75–1.33)	0.984
Region 4	1.06 (0.79–1.42)	0.645	1.16 (0.86–1.57)	0.329
Region 5	0.99 (0.75–1.29)	0.940	1.05 (0.79–1.38)	0.746
Region 6	0.76 (0.51–1.11)	0.158	0.88 (0.59–1.30)	0.522
Region 7	1.28 (0.97–1.69)	0.076	1.29 (0.97–1.71)	0.078
Region 8	0.95 (0.68–1.32)	0.751	1.12 (0.80–1.57)	0.522
Region 9	1.39 (1.06–1.81)	0.017	1.31 (0.99–1.72)	0.059
Region 10	1.22 (0.91–1.63)	0.168	1.36 (1.01–1.83)	0.041
Region 11	1.20 (0.91–1.58)	0.204	1.26 (0.95–1.67)	0.104
Mean VIF (variance inflation factor)3	–	–	2.30	–

DKT, dual kidney transplantation; KDPI, Kidney Donor Profile Index; KDRI, Kidney Donor Risk Index; OPTN, Organ Procurement and Transplantation Network; UNOS, United Network of Organ Sharing.

¹Total 16 931 observations were included for multivariable analysis.

²KDPI is calculated based on a scaling factor of 1.22219212347775, a median KDRI-UNOS value among all deceased kidney donors recovered during 2012.

³VIF <10 shows no significant multicolinearity among independent predictors.