Davison 1997.

Methods	Study design: patient‐randomized trial Unit of allocation: patient Unit of analysis: patient Power calculation: not clear
Participants	Care setting: specialized care and ambulatory care (Winnipeg Community Clinic); Canada Health professionals: 2; urologist; fully trained Patients: 60; prostate cancer; men
Interventions	Single intervention; patient‐mediated intervention (individual empowerment sessions) This session helped them to think on how to discuss with the doctor what treatment is best for them and what questions to ask the physician. Single intervention (control); patient‐mediated intervention (information package) A list of questions, also found in the empowerment session.
Outcomes	Perceived level of control in the decision‐making process (categorical); joint process between healthcare professionals and patients to make decisions
Notes	Additional information Number of approached patients (eligible): 60 Number of patients per physician: not reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "The group to which subjects were assigned was predetermined by a block randomization procedure" n.p.
Allocation concealment (selection bias)	Unclear risk	Comment: not specified in the paper.
Blinding (performance bias and detection bias) Participant‐reported outcome	Unclear risk	Comment: not specified in the paper.
Incomplete outcome data (attrition bias) Participant‐reported outcome	Low risk	Comment: for our primary outcome (n = 60).
Selective reporting (reporting bias)	Unclear risk	Comment: no evidence that outcomes were selectively reported, but no protocol.
Other bias	Low risk	Comment: no evidence of other risk of biases.
Baseline measurement? Participant‐reported outcome	Low risk	Quote: "At the pre‐test, no significant differences were found between the role preference of the groups (Chi2 = 4.365, P = 0.113)." page 194
Protection against contamination?	High risk	Comment: it was the patients who were randomized in one community clinic.
Baseline characteristics patients	Low risk	Quote: "The two groups were not significantly different from one another with reference to: age category, years of education, education category, marital status, residence, days from first interview, and intended/received treatment" n.p.
Baseline characteristics healthcare professionals	Unclear risk	Comment: no report of characteristics.