Montibeler 2018.

Study characteristics
Methods	Study design: randomised controlled trial Study grouping: parallel group
Participants	Baseline characteristics Massage with aromatherapy Age in years (range(N (%))): 25‐39 (12 (63%)) Sex (N (% female)): 17 (89%) Sample size: 19 Years of experience (range(N (%))): > 5 years (11 (58%)) Control (no intervention) Age in years (range (N (%))): 25‐39 (9 (47%)) Sex (N (% female)): 16 (84%) Sample size: 19 Years of experience (range(N (%))): > 5 years (14 (74%)) Overall Age in years (range(N (%))): 25‐39 (21 (55%)) Sex (N (% female)): 33 (87%) Sample size: 38 Years of experience (range(N (%))): > 5 years (25 (66%)) Included criteria: under employment bond and working in the surgical centre for at least one year; acceptance to participate in the study, including the stages of the study protocol; score of at least 12 points on the List of Stress Symptoms (LSS); and olfactory acceptance of the Lavandula angustifolia and Pelargonium graveolens aromas. Excluded criteria: all workers on vacation or on leave during the data collection period, as well as pregnant women. Pretreatment: except for the variable of time in the institution, there were no differences with statistical significance, confirming homogeneity among the study groups. Type of healthcare worker: nursing staff workers (nurses and nursing technicians) Response rate: 81% Compliance rate: 100%
Interventions	Intervention characteristics Massage with aromatherapy Type of the intervention: Intervention type 2 ‐ to focus one’s attention away from the experience of stress Description of the intervention: The massage technique applied was effleurage (or smoothing), in the posterior thoracic and cervical region. The aromatherapeutic formula applied to the massage was a neutral cream containing essential oils of Lavandula angustifolia and Pelargonium graveolens in the concentration of 1% each, and totalling 2% of essential oil in the formulation prepared by a professional pharmacist. The number of sessions: 6 Duration of each session on average: 10 to 5 mins Duration of the entire intervention: 1 to 2 weeks Duration of the entire intervention short vs long: short Intervention deliverer: Massages were performed by the first author, who was previously trained, and by an aromatherapy specialist nurse. Intervention form: During morning and afternoon sessions in the rest area of the sector with participants sitting in an armchair and ensuring their privacy 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	The List of Stress Symptoms (LSS) Outcome type: ContinuousOutcome Work stress scale (WSS) Outcome type: ContinuousOutcome
Identification	Sponsorship source: NR Country: Brazil Setting: A surgical center of a teaching hospital Comments: NR Authors name: Juliana Montibeler Institution: Universidade Estadual Paulista, Faculdade de Medicina de Botucatu, Departamento de Enfermagem Email: ju.montibeller.jm@gmail.com Address: Rua Dr. José Barbosa de Barros, 1540 – Bloco 2 – Apto 106CEP 18610‐307 – Botucatu, SP, Brazil Time period: 2016
Notes	LSS included in analysis 2.1
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	High risk	Quote: "A draw was made to randomize participants into two groups:"
Allocation concealment (selection bias)	High risk	Quote: "Esc Enferm USP · 2018;52:03348 A draw was made to randomize participants into two groups.
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 on online.
Other bias	Low risk	No indication of other bias.