Study	Reason for exclusion
Bauer 2006	Complex intervention to address what the authors termed collaborative care for bipolar disorder. Intervention consisted of three components: 1) Group psychoeducation in the first months of treatment; 2) Development of simplified clinical practice guidelines to produce an algorithm to guide pharmacological treatment and; 3) system reorganisation to ensure access to and continuity of care including scheduled care, demand responsive care, and outreach and inreach contacts to proactively follow‐up missed appointments and liaise with other service providers.
Bedi 2000	Patient preference trial.
Bieber 2008	Not mental health ‐ fibromyalgia.
Bunn 1997	No control group.
Chapman 2008	Observational study.
Clever 2006	Observational study.
Day 2005	Observational study.
Eisen 2000	Information exchange is uni‐directional and not concerning a specific decision.
Eisenthal 1979	Observational study.
Goossensen 2007	Observational study.
Graugaard 2000	Participants were not diagnosed with a mental health condition by DSM/ICD criteria.
LaFerriere 1978	Client and therapist jointly agree and document goals of psychotherapy ‐ part of psychotherapy process rather than SDM.
Little 2004	Participants not all diagnosed with mental health condition.
Ludman 2003	Complex intervention to deliver brief primary care‐based relapse prevention. Intervention consisted of four components: 1) an educational book and videotape about effective management of chronic or recurrent depression; 2) Two visits from a depression prevention specialist in the primary care clinic; 3) Three scheduled telephone monitoring contacts; and four mailings to the individual to enable continued monitoring and treatment adherence.
Maas 2004	Not SDM.
Malm 2003	Complex intervention. Intervention consisted of integrated mental health care: a combination of anti‐psychotic drug treatment, psycho‐educational family intervention, living skills training together with a social network resource for SDM, structured communication training and structured problem solving training.
Schneider 2006	Observational study.
Startup 2006	Observational study.
Swanson 2007	Observational study.
Von Korff 2003	Complex intervention to deliver brief primary care‐based relapse prevention. Intervention was the same as delivered by Ludman 2003.
Wong 2007	Study to determine whether certain communication skills could be taught. No outcome measures apart from communication behaviours.
Young 2008	Observational study.