Machine perfusion distribution across clinical phenotypes in kidney transplantation: A national cohort study using unsupervised clustering

Table 1 Features selected for modelling and their missingness percentage before imputation

Features	Missing data full cohort (n = 15904) (%)	Missing data MP subgroup (n = 544) (%)
Recipient BMI	19.98	22.61
Serum creatinine (umol/L) 12-month post-transplant	19.54	13.42
Serum creatinine (umol/L) 3-month post-transplant	15.79	13.79
Recipient deprivation group	16.17	31.25
Predniscolone/predniscone immunosuppression 3 months post-transplant	16.10	13.24
Type of dialysis at transplant	15.17	16.36
Donor allergy	12.09	10.85
Initial graft function	8.53	9.93
Donor cause of death	5.29	4.60
Recipient positive CMV status	4.89	5.33
Donor family history of diabetes	4.52	4.41
Recipient ethnicity	4.44	4.04
Donor positive EBV status	4.21	2.76
Donor creatinine at retrieval	3.41	5.88
Donor ethnicity	3.40	2.21
Donor history of drug abuse	2.50	3.68
Donor history of cardiac disease	2.18	4.23
Donor history of UTI	1.88	2.57
Donor hypertension	1.62	2.02
Donor positive toxo status	1.37	1.10
Perfusate used	1.08	0.74
Donor history of diabetes	0.91	1.29
Perfusion quality	0.74	2.94
Donor positive CMV status	0.59	1.10
Graft status	0.57	0
Follow-up time	0.55	0
Donor BMI	0.53	0.37
Donor smoker	0.52	0.55
Dialysis status at registration	0.35	0.18
Cold ischemia time	0.22	0.37
Allocation matchability score	0.18	0
Waiting list time	0.17	0.18
Dialysis status at transplant	0.13	0
Kidney used by local centre	0.10	0
Donor ABO blood group	0.04	0
Recipient sex	0.04	0.18
Highly sensitised status flag	0.03	0
Donor homozygous at DR locus	0.01	0
Donor homozygous at B locus	0.01	0
Donor homozygous at A locus	0.01	0
HLA mismatch group	0.01	0
Recipient homozygous at B locus	0.01	0
Recipient homozygous at DR locus	0.01	0
Recipient homozygous at A locus	0.01	0
Number of mismatches at DR locus	0.01	0
Number of mismatches at A locus	0.01	0
Number of mismatches at B locus	0.01	0
Recipient age	0	0
Donor sex	0	0
Donor type	0	0
Recipient diabetes	0	0
Donor age	0	0
Recipient ABO blood group	0	0
Donor organ	0	0
Transplant year	0	0
Machine perfusion type	0	0

BMI: Body mass index; UTI: Urinary tract infection; HLA: Human leukocyte antigen; EBV: Epstein-Barr virus; CMV: Cytomegalovirus.