Eickhoff 1987.

Methods	Site: Femoral to BK popliteal Study design: multicentre RCT Method of randomisation: sealed envelopes Blinding: unblinded, intention to treat Exclusions post randomisation: none Losses to follow up: none
Participants	Country: Scandinavia Setting: hospital No. of participants: 105 (55 PTFE, 50 HUV) Age: 68 yrs Sex: 60 male, 45 female Inclusion criteria: DM 12, critical ischaemia 80. BK fem‐pop for short distance IC or critical ischaemia, if no vein or CABG intended Exclusion criteria: short life expectancy, previous graft, Buerger's, coagulopathy
Interventions	PTFE versus HUV (diameter at discretion of operating surgeon)
Outcomes	Secondary patency
Notes	Post‐op anti‐thrombotic/coagulant therapy unknown
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Unclear as to how the randomisation sequence was generated
Allocation concealment (selection bias)	Low risk	Sealed envelopes used
Blinding of participants and personnel (performance bias) All outcomes	High risk	Operative blinding impossible in this type of trial
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Outcome assessors and patients not obviously blinded
Incomplete outcome data (attrition bias) All outcomes	Low risk	No losses, clear life table data
Selective reporting (reporting bias)	Low risk	All stated outcomes reported
Other bias	Unclear risk	Anticoagulation protocol not stated