Coen 2011.

Study characteristics
Methods	RCT
Participants	N = 27 (14F/13M) Dementia ‐ MMSE 10‐23 MMSE: 16.9 (SD 5.0) Age: 79.8 (SD 5.6) Groups ran in 2 long‐term care facilities and a private nursing home
Interventions	Cognitive stimulation (N = 14) No treatment (N = 13)
Outcomes	Cognition: MMSE; ADAS‐Cog Quality of life: QoL‐AD Mood: Geriatric Depression Scale (14‐item); RAID (Rating of Anxiety in Dementia) Behaviour: Behaviour Rating Scale (CAPE) Clinical Dementia Rating (sum of boxes)
Notes	45 minutes, 2 times a week for 7 weeks
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Stated that participants were randomly assigned. Author confirmed computerised randomisation and random number tables were used.
Allocation concealment (selection bias)	Unclear risk	Unclear who carried out randomisation and whether this was independent
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Tests administered by staff blind to group membership
Incomplete outcome data (attrition bias) All outcomes	Low risk	No attrition reported
Selective reporting (reporting bias)	Low risk	Data for all measures reported
Other bias ‐ training and supervision	Unclear risk	Sessions led by occupational therapists and activity coordinator ‐ training/supervision unclear
Other bias ‐ treatment manual	Low risk	Used Spector 2006 manual