Characteristics of study population (n=140)
| Mean age ± SD (years) | 37.28±8.97 |
| Sex, n (%) | |
| Female | 47 (33.57) |
| Male | 93 (66.43) |
| Professional category, n (%) | |
| Physicians | 45 (32.14) |
| Emergency medicine physicians | 29 (20.71) |
| Anaesthesia and critical care physicians | 16 (11.43) |
| Nurses | 45 (32.14) |
| Anaesthesia nurses | 27 (19.29) |
| Emergency medicine nurses | 18 (12.86) |
| First-aid workers | 50 (35.71) |
| Firefighters | 31 (22.14) |
| Emergency medical technicians | 17 (12.14) |
| Red Cross first-aid rescuers | 02 (1.43) |
| Professional experience, n (%) | |
| High (≥10 years) | 63 (45.00) |
| Medium (5≤n<10 years) | 36 (25.70) |
| Little (<5 years) | 41 (29.30) |
| Size of the hand squeezing the bag, n (%) | |
| Large (≥23 cm) | 21 (15.00) |
| Medium (19≤n<23 cm) | 101 (72.14) |
| Small (15≤n<19 cm) | 18 (12.86) |
| Grip strength of the hand squeezing the bag, n (%) | |
| High (≥40 kgF) | 53 (37.90) |
| Medium (20≤n<40 kgF) | 65 (46.40) |
| Weak (0≤n<20 kgF) | 22 (15.70) |