Wells 2013.

Methods	Randomised controlled trial
Data	Setting: secondary care, USA. Participants were Hispanic cancer 31 patients, scheduled for consultation with medical oncologist, never asked about cancer trial, Spanish as preferred language
Comparisons	Investigated multimedia presentation of information Intervention: Spanish‐language multimedia information about clinical trials Comparator: Spanish‐language written information about clinical trials
Outcomes	Willingness to participate in a hypothetical trial
Notes
Risk of bias
Item	Authors' judgement	Description
Random Sequence generation ok?	Yes	Adequate
Allocation concealment?	Yes	Adequate
Blinding of participants and personnel ok?	Unclear	Given that trial was hypothetical, not clear whether being unblinded might influence stated willingness to take part in a future trial, especially if it was the same research assistant who was there when participants watched video/read booklet, and phoned them to do outcome assessment
Blinding of outcome assessment ok?	Unclear	As above
Incomplete outcome data handled ok?	Yes	Adequate
Free of selective reporting?	Unclear	Recruitment reported and this is only outcome needed for review
Was the study free of other bias?	No	Trial was hypothetical
Overall bias?	Yes	High risk of bias