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Participant characteristics and the respirators used
| Participant Characteristic | Number (%) |
|---|---|
| Number of participants | 70 |
| Number male (%) | 22 (31%) |
| BMI (SD) | 25.0 (4.31) |
| Age in years n (%) | |
| <30 | 26 (37%) |
| 30–50 | 34 (49%) |
| >50 | 10 (14%) |
| Ethnicity n (%) | |
| Asian | 19 (27%) |
| Caucasians | 49 (70%) |
| Other | 2 (3%) |
| N95 respirator used | |
| Duckbilled (ProShield$ medium or Halyards# Fluidshield) | 29 (41%) |
| Cup-shaped (3M 1860*) | 22 (31%) |
| 3 panel flat-fold (3M 1870*) | 19 (27%) |
