Hung 2015.

Study characteristics
Methods	RCT, 2 parallel groups, 2 training variants
Participants	Intervention group: N = 25, age 44% < 31 years, healthcare assistant 56%, nurse 44%, work experience < 6 years 44%, no gender reported Control group: N = 25, age 28% < 31 years, healthcare assistant 56%, nurse 44%, work experience < 6 years 48%, no gender reported All HCW of an outpatient department of a private hospital handling infectious patients before admission; able to read English, basic computer skills
Interventions	Intervention: training: extra computer simulation All participants were asked to don and doff N95 respirator, face shield, cap, gown, gloves for "precautions against airborne danger". External observers rated the procedures for errors. All participants then attended a PPE‐training consisting of a 15‐min demonstration of donning and doffing by an "infection control link nurse". After 1 week the intervention group got the interactive computer simulation programme and again after 1 week was assessed for compliance with the donning and doffing procedures. Control: the control group was assessed for compliance with donning and doffing procedures 1 week after PPE training. The group did not get the computer simulation training.
Outcomes	Primary outcome: score on 16‐item checklist for donning and 20‐item checklist for doffing. Secondary outcome: IBM computer system usability questionnaire (CSUQ) consisting of 19 items with a 7‐point Likert response scale
Notes	Hong Kong China; funding: Hong Komg Research Grant Council; no conflict of interest reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "The subjects were randomly assigned to the control and experimental group of the same size", page 53
Allocation concealment (selection bias)	Unclear risk	Not reported
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Not possible to blind participants or providers but outcome objectively assessed by observers, unlikely that this was influenced
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Nurse assessing PPE compliance "was blinded about the research", page 53
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Not reported if all participants contributed data
Selective reporting (reporting bias)	High risk	Results of computer usability questionnaire not fully reported
Other bias	Low risk	No other biases assessed