Table 4 Construction of scales with factor solutions and reliability analysis of 20 interview-based items

Construct 1: Guidance by the clinician (α = .741)

… your clinician gives you advice about the best treatment option for you?

… the treatment that best fits for you is chosen?

… you ask the questions you have?

Construct 2: Conduct of clinician (α = .774)

… your clinician takes you seriously?

… your clinician takes time for you?

… your clinician takes your treatment preferences seriously?

… your clinician provides opportunity to ask questions?

Construct 3: Preparation for treatment decision making (α = .864)

… you receive information from your clinician about all possible treatment options?

… you receive information from your clinician about your disease?

… you follow your clinician in the proposed treatment advice?

… you decide together with your clinician about your treatment?

… your clinician asks you what you think of the different treatment options?

… your clinician gives you information about your disease that is understandable?

Construct 4: Active role of patient in treatment decision making (α = .782)

… you receive time from your clinician to think about what treatment you want to have?

… you search for information (for example on the Internet) about possible treatment options?

… you eventually decide with your family what treatment you want to have?

… your clinician lets you decide what treatment you want to undergo?

… your clinician asks you about your situation at home?