Table 3.

 Principal components analysis of the shared decision‐making items

Aspect of consultation	Subscales
	I	II	III
	Treatment	Evidence	Patient challenges
Item 15: multiple options presented	0.78	0.27	−0.03
Item 20: option to defer decision	0.73	0.06	0.21
Item 16: treatment process described	0.68	0.21	−0.16
Item 19: patient values considered	0.61	0.13	0.01
Item 10: patient views enquired upon	0.55	0.05	0.11
Item 14: treatment option presented	0.45	−0.07	−0.04
Item 13: ensure patient understanding	0.37	−0.05	0.22
Item 7: quality of research discussed	0.02	0.83	0.05
Item 8: physician appraisal of data	−0.09	0.82	0.06
Item 9: research relevant to patient	0.22	0.73	0.35
Item 6: evidence presented	0.35	0.61	0.45
Item 2: history reviewed	−0.05	0.43	−0.14
Item 11: asked re amount of information	0.15	0.37	−0.07
Item 1: reason for consultation established	0.36	0.37	−0.21
Item 12: asked re decision preference	0.20	0.30	−0.09
Item 18: possibilities & outcomes discussed	0.04	−0.06	0.82
Item 17: side‐effects discussed	0.13	−0.11	0.76
Item 3: social circumstances reviewed	−0.24	0.27	0.35
Cronbach’s alpha	0.74	0.75	0.50

The largest Cronbach’s alpha values are given in bold.