Montaner 2021.

Study characteristics
Methods	Study design: randomised controlled trial Study grouping: parallel group
Participants	Baseline characteristics Acceptance and Commitment Therapy (ACT) Age (mean ± SD): 40.5 ± 12.8 Sex (N (% female)): 49 (96%) Sample size: 51 Years of experience (mean ± SD): NR Control (wait list) Age (mean ± SD): 41.8 ± 12.3 Sex (N (% female)): 49 (91%) Sample size: 54 Years of experience (mean ± SD): NR Overall Age (mean ± SD): NR Sex (N (% female)): 98 (93%) Sample size: 105 Years of experience (mean ± SD): NR Included criteria: the inclusion criteria were to be over 18 years old and have at least 6 months of experience in the ce Excluded criteria: NR Pretreatment: no significant group differences were found at baseline for demographics, neither for outcome measures. Compliance rate: 86% Response rate: 43% Type of healthcare worker: various
Interventions	Intervention characteristics Acceptance and Commitment Therapy (ACT) Type of the intervention: Intervention type 4 ‐ Combination of two or more of the above Description of the intervention: The intervention was specifically designed for workers providing services in the dementia context. Implement each of the hexaflex components of ACT (Contact with the Present Moment, Acceptance, Self as Context, Cognitive Defusion, Values and Committed Action) in different sessions (including meditation exercise). The number of sessions: 6 sessions Duration of each session on average: 90 minutes Duration of the entire intervention: NR Duration of the entire intervention short vs long: Short Intervention deliverer :neuropsychologist of the Social and Health Centre widely trained and experienced in dementia care and ACT Intervention form: conducted in the work setting Control (wait list) Type of the intervention: NA Description of the intervention: NA The number of sessions: NA Duration of each session on average: NA Duration of the entire intervention: NA Duration of the entire intervention short vs long: NA Intervention deliverer: NA Intervention form: NA
Outcomes	Maslach Burnout Inventory ‐ Emotional Exhaustion Outcome type: ContinuousOutcome Maslach Burnout Inventory ‐ Depersonalisation Outcome type: ContinuousOutcome Maslach Burnout Inventory ‐ Personal accomplishment Outcome type: ContinuousOutcome State‐Trait Anxiety Inventory (STAI) ‐ Anxiety‐Trait Outcome type: ContinuousOutcome
Identification	Sponsorship source: Country: NR  Setting: CSSV Ricard Fortuny Hospital: a center made up of 6 long‐term hospitalization units, two nursing home units, a day center and a palliative unit.  Comments: NR Authors name: Xavier Montaner Institution: Consorci Sociosanitari Ricard Fortuny Email: xavier.casino@gmail.com Address: Avinguda Garraf 3, 08720, Vilafranca del Penedés (Barcelona), Spain Time period: The study was carried out between May 2017 and September 2018
Notes	MBI‐EE included in analysis 4.1 and 4.2 STAI included in analysis 4.4 and 4.5
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "randomly assigned"
Allocation concealment (selection bias)	Unclear risk	Not described
Blinding of participants and personnel (performance bias) All outcomes	High risk	Participants were 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	Low risk	Quote: "The drop‐out rate at the end of the intervention in the sample as a whole was 15.5%, 17.3% at 3 months of follow‐up, and 20% at 12 months of follow‐up. Although the attrition effect was higher in the IG, there were no statistically significant differences between groups drop‐out rates (Table 2)."
Selective reporting (reporting bias)	Unclear risk	No trial registration, nor did we find one online.
Other bias	Low risk	No indication of other bias.