Endotracheal Intubation Using a Direct Laryngoscope and the Protective Performances of Respirators: A Randomized Trial
Table 2
Fit factor of N95 or a higher mask in the baseline scenario and intubation scenario ().
Types of N95 or a higher mask
Cup type
Fold type
Valve type
value
Cup type versus fold type
Cup type versus valve type
Fold type versus valve type
Baseline phase
Fit factor
200 (200-200)
200 (200-200)
200 (179–200)
0.107
0.015
0.225
0.009
Adequate protection (percent)
100 (78.61–100)
100 (100-100)
100 (76.1–100)
0.081
0.031
0.266
0.104
Intubation phase
Fit factor
200 (102.75–200)
200 (200-200)
142.5 (63.5–200)
<0.001
0.001
0.048
<0.001
Adequate protection (percent)
74.16 (36.1–98.91)
100 (91.61–100)
62.5 (8.13–100)
0.011
<0.001
0.118
<0.001
Intubation time
Intubation time† (seconds)
33.24 (2.58)
28.69 (1.55)
29.88 (1.63)
0.247
0.324
0.70
1.00
Intubation success rate
Intubation success rate (percent)
24 (100)
24 (100)
24 (100)
Preference
Preference
2 (8.3)
10 (41.7)
12 (50.0)
Categorical variables are given as numbers (percentage). Continuous variables with a normal distribution are given as mean (SD). The nonparametric variables are given as median (IQR). Cup type: 3M 1860. Fold type: 3M 1870. Valve type: 3M 9332. Success rate is the percentage of fit factor greater than or equal to 100. †Intubation time is the time from inserting the blade into the mouth to the first ventilation.
