Mache 2015.

Study characteristics
Methods	Study design: randomised controlled trial Study grouping: parallel group
Participants	Baseline characteristics Psychosocial Resiliency Training Age in years (mean ± SD): NR Sex (N (% female)): 26 (62%) Sample size: 42 Years of experience (mean ± SD): NR Control (no intervention) Age in years (mean ± SD): NR Sex (N (% female)): 25 (59%) Sample size: 43 Years of experience (mean ± SD): NR Overall Age in years (mean ± SD): 28 Sex (N (% female)): 51 (60%) Sample size: 85 Years of experience (mean ± SD): NR Included criteria: inclusion criteria were (1) employment as a hospital doctor, (2) working at least full time, (3) work‐ing experience of less than a year, (4) being able and willing to participate, and (5) agreement to complete a survey at least two times. Excluded criteria: NR Pretreatment: baseline data on gender, age, and perceived health indicate only small, insignificant differences between the control and the intervention group. Type of healthcare worker: exclusively junior physicians Response rate: NR Compliance rate: 89%
Interventions	Intervention characteristics Psychosocial Resiliency Training Type of the intervention: Intervention type 1 ‐ to focus one’s attention on the experience of stress Description of the intervention: psychosocial resilience training combined with cognitive behavioural and solution‐focused counselling in a group. The main focus was on coping strategies, support between the participants, and solutions and goals for the future. The number of sessions: 12 Duration of each session on average: 2 hours Duration of the entire intervention: 12 weeks Duration of the entire intervention short vs long: long Intervention deliverer: Two psychologists delivered the intervention. Both of them were familiar with cognitive behavioural and solution‐focused work in group settings Intervention form: Group and individual; face‐to‐face and at home Control (no intervention) 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	Perceived Stress Questionnaire (PSQ) Outcome type: ContinuousOutcome
Identification	Sponsorship source: NR Country: Germany Setting: Hospital: several clinic departments specialising in different medical specialities (e.g., internal medicine, paediatrics, neurology, and gynaecology). Comments: NR Authors name: Stefanie Mache Institution: Institute for Occupational and Maritime Medicine (ZfAM), University Medical Center Hamburg‐Eppendorf Email: s.mache@uke.de Address: Seewartenstrasse 10, 20459 Hamburg, Germany Time period: February to August 2014
Notes	PSQ included in analysis 1.1, 1.2
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	High risk	Quote: "physicians were randomized into an intervention and control group. Of"
Allocation concealment (selection bias)	Unclear risk	Not mentioned.
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	No loss to follow‐up.
Selective reporting (reporting bias)	Unclear risk	No trial registration, nor did we find one online.
Other bias	Unclear risk	Response rate not reported.