Redhead 2011.

Study characteristics
Methods	RCT, UK
Participants	42 nurses working in a low‐secure mental health unit (LSU). Inclusion criteria: working on the LSU for a minimum of 35 hours and having direct contact with service users. Exclusion criteria: having been previously trained in Psychosocial Intervention. Quote: "A total of 79 nursing staff worked on the LSU. Forty‐two (58%) volunteered to participate in the study and provided informed consent. Of the remaining 37 staff, none actively refused, but eight were on sick leave, 23 were unable to be released by their managers to attend the training and six were excluded as they had previously been trained in PSI." (p. 61) Quote"There were no significant differences at baseline between the experimental and control groups in terms of age, gender, clinical area or qualification." (p. 62)
Interventions	1) Experimental: psychosocial intervention training (12 qualified and 10 unqualified nurses). Quote: "Nurses allocated to the experimental group attended a PSI [Psychosocial Intervention] training programme which was delivered in a meeting room within the LSU. As the learning outcomes for qualified and unqualified staff were different, they were trained on separate courses. The training programme for qualified staff consisted of 16 half‐day sessions delivered over 8 months. The content covered a broad range of PSI including cognitive behavioural approaches for managing symptoms..." " The training for unqualified staff was delivered in 8 half‐day sessions and focused on understanding symptom related behaviours, relationship formation and helping services users to cope with symptoms..." "Teaching sessions were supplemented by small group supervision..." (p. 61) 2) Control: no intervention control (9 qualified and 11 unqualified nurses)
Outcomes	The MBI
Identification
Notes	From reference list: Doyle 2007 ‐ check for inclusion MBI‐EE included in analysis 3.2
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "A randomized controlled design was adopted with nurses who volunteered to participate being allocated to either the experimental PSI training group or a waiting list control group." (p. 60) Random sequence generation process insufficiently described.
Allocation concealment (selection bias)	Unclear risk	Not reported if group allocation was concealed
Blinding of participants and personnel (performance bias) All outcomes	High risk	Participants not blinded.
Blinding of outcome assessment (detection bias) All outcomes	High risk	Participants were not blinded whereas outcomes are self‐reported.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Apparently no participants were lost to follow‐up
Selective reporting (reporting bias)	Low risk	The authors report all results for outcome measures listed in the Methods section
Other bias	Unclear risk	We did not find any indications of other sources of bias