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Table 1
Measurements and variables assessed
Type of variable	Variables assessed	Scale or sub-scale	Measures, Author, Year	Number of items	Timeframe

					Entry	After consultation	2 weeks after consultation

1.0 Relationship-centered measures administered in physicians and patients

1.1 Essential elements of SDM (Makoul & Clayman, 2006)

	1.1.1 Knowledge-related Component

	Define/explain problem	Information Giving	Medical Communication Competence Scale, Cegala 1998	9		x

	Present options

	Discuss pros/cons

	Doctor knowledge/recommendations	Doctor recommendations	Patient-Physician Discordance Scale, Sewitch, 2001	7		x

		Perception of the effectiveness of the decision	Decisional Conflict Scale, O'Connor 2005	7		x

	Check/clarify understanding	Information verifying	Medical Communication Competence Scale, Cegala 1998	4		x

		Feeling uninformed	Decisional Conflict Scale, O'Connor 2005	4		x

	1.1.2 Value-related Component

	Patient values/preferences	Values clarification	Decisional Conflict Scale, O'Connor 2005	4		x

		Support	Decisional Conflict Scale, O'Connor 2005	3		x

		Uncertainty	Decisional Conflict Scale, O'Connor 2005	3		x

	Discuss patient ability/self-efficacy	Self-efficacy	Theory of planned behavior	3		x

1.2 Other	1.2.1 Dyadic OPTION	Dyadic OPTION	Dyadic OPTION, Elwyn 2008	12		x

2.0 Patient outcomes

	2.1 Decisional regret	Decisional regret scale	Decisional Regret Scale, Brehault 2003	5			x (patient)

	2.2 Quality of life	Quality of life	Short-form 12, Ware 1996	12			x (patient)

3.0 Characteristics of physicians and patients

	3.1 Attitude towards clinical decisions	Anxiety due to uncertainty	Physician's reaction to uncertainty scales, Gerrity 1995	5	x (physician)

		Reluctance to disclose uncertainty to patients	Physician's reaction to uncertainty scales, Gerrity 1995	5	x (physician)

	3.2 Sociodemographics (physicians and patients)				x (physician)	x (patient)

4.0 Other

	4.1 OPTION third observer	OPTION third observer	OPTION third observer, Elwyn 2001	12		x

Légaré et al. Implementation Science 2009 4:14 doi:10.1186/1748-5908-4-14

Table 1