Brierley 2012.

Methods	Randomised controlled trial
Data	Setting: primary care, UK. 2330 participants were people eligible for a trial about computerised CBT in depression
Comparisons	Investigated effect of length of the participant information leaflet on recruitment. Intervention: short participant information leaflet (not clear how short) as initial info about trial Comparator: full length participant information leaflet (8‐pages) as initial info about trial
Outcomes	Proportion recruited to 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?	Yes	People sending out packs blind, as well as potential participants
Blinding of outcome assessment ok?	Yes	Adequate
Incomplete outcome data handled ok?	Yes	Adequate
Free of selective reporting?	Yes	Recruitment reported and this is only outcome needed for review.
Was the study free of other bias?	Yes	No other biases apparent
Overall bias?	No	Low risk of bias