Gonzalez 2015.

Methods	Cluster RCT.
Participants	42 participants with a diagnosis of AD living in 2 nursing homes in Valencia, Spain. Diagnosis determined by DSM‐IV‐TR, MMSE < 23 and impairment on a neuropsychological examination. Mean age: 80.24 years.
Interventions	Intervention: group integrative reminiscence programme. Control: treatment as usual.
Outcomes	Quality of life: Ryff Psychological Well‐Being scales. Cognitive: MMSE (Spanish Version). Mood‐related outcomes: CES‐D.
Length and frequency of intervention	10 weekly sessions, each lasting 60 minutes.
Time points measured	Pretest (2 weeks before the intervention) and post‐test (immediately after intervention).
Number of participants who did not complete study	0/42.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Cluster randomisation. "Nursing homes were randomised to determine where the intervention program would be administered." No explanation was given of the randomisation procedure.
Allocation concealment (selection bias)	Unclear risk	No details given.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Unclear who administered assessments.
Incomplete outcome data (attrition bias) All outcomes	Low risk	n/a.
Selective reporting (reporting bias)	Low risk	All outcomes listed in the methods section were reported and there was no evidence of selective outcome reporting.
Other bias	Unclear risk	Cluster RCT. The study had 2 clusters but was not large enough to apply the methods detailed in the Cochrane Handbook for Systematic Reviews of Interventions to reduce it to its effective sample size. No evidence of baseline imbalanced, missing clusters from the analysis or recruitment bias.
Availability of training and supervision Objective outcome measures	Unclear risk	Programme led by a psychologist but no information regarding current/previous training/supervision.
Availability of manual or protocol for intervention All outcomes	Low risk	Paper stated that the authors "implemented a programme based on earlier research." No manual but paper described detailed aims and activities for each individual session.