Heil 1987

Methods	Study design: parallel RCT Duration of study: not reported Duration of follow‐up: 1 year
Participants	Country: Minnesota, USA Setting: single centre Donor characteristics Mean age ± SD (years): not reported Number of DCD: not reported Number of ECD: not reported Sex (M/F); not reported Inclusion criteria: not reported Exclusion criteria: not reported Recipient characteristics Inclusion criteria: not reported Exclusion criteria: not reported Sex (M/F): not reported Mean age ± SD (years): not reported
Interventions	Machine perfusion Waters Mox‐100 pulsatile perfusion machine using silica gel fractionated plasma Static cold storage Euro‐Collins solution Mean CIT Data on length of CIT was not reported, but there was a randomisation procedure as to which organ was transplanted first
Outcomes	DGF One year graft survival
Notes	54 kidneys from 27 donors One kidney from each pair assigned to MP and the other to SCS Very short manuscript, lacking a lot of information Funding source: not reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Insufficient information to permit judgement
Allocation concealment (selection bias)	Low risk	Sealed envelopes were used to decide which kidney would receive MP
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	No information on blinding, or on differences in CIT between groups
Blinding of outcome assessment (detection bias) All outcomes	Low risk	No information, but outcome measurements are unlikely to be affected by the lack of blinding
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Insufficient information to permit judgement
Selective reporting (reporting bias)	Low risk	Appropriate outcomes, adequately reported
Other bias	Unclear risk	Extremely short manuscript making thorough analysis of biases impossible