van Tol‐Geerdink 2016.

Methods	Study design: randomized trial Unit of allocation: patient Unit of analysis: patient Power calculation: not done
Participants	Care setting: ambulatory care, specialized care, the Netherlands Health professionals: specialists; fully trained Patients: 240; prostate cancer; male
Interventions	Single intervention: patient‐mediated intervention (decision aid) Quote: ''The decision aid explained that there are different treatment options with different pros and cons. Radial protatectomy and external beam radiotherapy were presented to all patients. A third option, bradytherapy was presented only to eligible patients.'' page 463 Usual care (control)
Outcomes	Patient participation (qualitative)
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Comment: no information about sequence generation.
Allocation concealment (selection bias)	Low risk	Quote: "Randomization was centralized to avoid allocation bias and was blocked in groups of 3 per hospital, thus stratifying for hospital site." page 461
Blinding (performance bias and detection bias) Participant‐reported outcome	High risk	Quote: "Patients and caregivers could not be blinded to the intervention." page 460
Incomplete outcome data (attrition bias) Participant‐reported outcome	High risk	Comment: there are losses to follow‐up after randomization and missing data and reasons were not well‐balanced (flow chart of the study).
Selective reporting (reporting bias)	Unclear risk	Comment: no information about registration of the protocol.
Other bias	Low risk
Baseline measurement? Participant‐reported outcome	Unclear risk	Comment: no outcome measure at baseline.
Protection against contamination?	High risk	Comment: randomization was done at the patient level.
Baseline characteristics patients	Low risk	Quote: "Patient characteristics in the decision aid group and the usual care group were comparable for education, age, baseline physical functioning and tumour characteristics." page 465
Baseline characteristics healthcare professionals	Unclear risk	Comment: no information about clinicians at baseline.