Kline 2020.

Study characteristics
Methods	Study design: randomised controlled trial Study grouping: parallel group
Participants	Baseline characteristics Dog Age (mean ± SD): 31 ± 7.1 Sex (N (% female)): 20(50) Sample size: 43 Years of experience (mean ± SD): NR Coloring Age (mean ± SD): 32 ± 7.3 Sex (N (% female)): 20(50) Sample size: 39 Years of experience (mean ± SD): NR Control (no intervention) Age (mean ± SD): 33 ± 7.2 Sex (N (% female)): 18(49) Sample size: 40 Years of experience (mean ± SD): NR Overall Age (mean ± SD): NR Sex (N (% female)): NR Sample size: 122 Years of experience (mean ± SD): NR Included criteria: emergency care providers, including nurses, residents, and physicians on duty in the ED of Eskenazi hospital Excluded criteria: provider statement of dislike, allergy, fear or other reason to not interact with a therapy dog, and prior enrolment Pretreatment: no significant differences in age and gender between the two experimental groups and the control group. Authors did not report any other results. Compliance rate: 127 eligible and 122 participated in at least 50% of the intervention thus > 96% Response rate: NR Type of healthcare worker: nurse, physician resident
Interventions	Intervention characteristics Dog Type of the intervention: Intervention type 2 ‐ to focus one’s attention away from the experience of stress Description of the intervention: Being in a room with a dog, participants were allowed to touch the dog The number of sessions: 1 Duration of each session on average: 5 minutes Duration of the entire intervention: beginning of the shift until the end of the shift Duration of the entire intervention short vs long: short Intervention deliverer: NR Intervention form: individual Colouring Type of the intervention: Intervention type 2 ‐ to focus one’s attention away from the experience of stress Description of the intervention: Colouring mandalas in a room The number of sessions: 1 Duration of each session on average: 5 minutes Duration of the entire intervention: beginning of the shift until the end of the shift Duration of the entire intervention short vs long: short Intervention deliverer: NR Intervention form: individual 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:
Outcomes	Perceived Stress Scale (PSS) Outcome type: ContinuousOutcome Stress (VAS) Outcome type: ContinuousOutcome
Identification	Sponsorship source: NR Country: USA Setting: Hospital Comments: NR Authors name: Jeffrey A Kline Institution: Indiana University School of Medicine, Indianapolis Email: jefkline@iupui.edu Address: Indiana University School of Medicine, Indianapolis Time period: 2018
Notes	Author J Kline kindly provided the mean and SD of the primary outcome for the intervention groups. Modified PSS included in analysis 2.1. Intervention groups combined to create a single pair‐wise comparison
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "were randomized by preprinted random sequence to receive either exposure to a therapy dog or to coloring a mandala."
Allocation concealment (selection bias)	Unclear risk	Insufficient information to understand whether intervention allocations could have been foreseen in advance of, during, enrolment.
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)	Low risk	Trial registration NCT03628820. No selective outcome reporting.
Other bias	Unclear risk	Response rate not reported.