Study	Reason for exclusion
Alexander 2006	The design of the study was not appropriate
Aljumah 2015	Data regarding the outcome were not available
Allen 2009	The study type was not appropriate. This is a one group pre/post‐test quasi‐experimental design
Boehmer 2014	The outcome was not appropriate
Boyd 2010	The outcome was not appropriate
Brinkman 2013	The study design was not appropriate
Brown 2004	The outcome was inappropriate, only preference was stated
Davison 2007	The intervention was after the consultation
Golnik 2012	The design of the study was not appropriate. Inappropriate number of control sites, less than four
Green 2011	The outcome was not appropriate
Hack 2007	The intervention was after the consultation
Hanson 2011	The outcomes were not appropriate
Harmsen 2014	The intervention was not appropriate
Hermansen Kobulnicky 2002	Relevant data were not presented and are clearly unobtainable
Hoffman 2014	Hypothetical scenario
Jangland 2012	The study design was not appropriate
Koekkoek 2012	The study design was not appropriate
Kopke 2009	The outcomes were not appropriate, only the active patient was reported and not the shared decision
Kupke 2013	The outcome was not appropriate
Langewitz 1998	The outcome related to SDM is limited to a single item from an observer‐based multiple instrument
Leader 2012	The outcomes of the study were not appropriate
LeBlanc 2017	The outcome was not appropriate
Man‐Son‐Hing 1999	The outcomes of the study were not appropriate
Maslin 1998	Relevant data were not presented and are clearly unobtainable
McCormack 2011	The design of the study was not appropriate. Inappropriate number of control sites, less than four
NCT01550731	The outcome was not appropriate
NCT02033499	The outcome was not appropriate
NCT02319525	The outcome was not appropriate
Ockhuysen‐Vermey 2008	The outcomes of the study were not appropriate
Price‐Haywood 2014	The outcome was reported by a standardized patient
Riippa 2014	The study design was not appropriate
Roelands 2004	The outcomes of the study were not appropriate
Schwalm 2012	The outcomes of the study were not appropriate
Simon 2012	The participants in the study were not appropriate. The healthcare professional was virtual, so it was difficult to measure SDM
Smith 2010a	The outcomes of the study were not appropriate; we could not be sure if the preference for involvement in the screening decision was the actual or preferred involvement.
Spertus 2011	The design of the study was not appropriate. This is a pre‐post‐ cross‐sectional study
van Tol‐Geerdink 2008	The design of the study was not appropriate
Wagner 2012	The outcome was not appropriate
Whelan 2003	The outcomes of the study were not appropriate, only the active patient was reported and not the shared decision

SDM: shared decision making.