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Table 3 Trend over time of FiO2, EtCO2, and RR

From: Effects of wearing surgical masks on fraction of inspired oxygen in spontaneously breathing patients: improving safety for frontline healthcare professionals under pandemic situations

  With a surgical mask: Mean (SD) Without a surgical mask: Mean (SD) P value
FiO2
1 min 0.39 (0.19) 0.62 (0.084) <  0.0001
2 min 0.57 (0.13) 0.64 (0.080) <  0.0001
3 min 0.59 (0.10) 0.68 (0.082) <  0.0001
4 min 0.61 (0.085) 0.69 (0.083) <  0.0001
5 min 0.62 (0.081) 0.71 (0.077) <  0.0001
EtCO2(mmHg)
1 min 32.3 (8.52) 33.5 (5.50) 0.1954
2 min 35.2 (5.48) 28.6 (7.23) <  0.0001
3 min 35.1 (4.60) 23.8 (5.56) <  0.0001
4 min 34.6 (5.03) 22.9 (5.05) <  0.0001
5 min 34.6 (4.37) 22.7 (4.45) <  0.0001
RR
  With a surgical mask: Mean (SD) Without a surgical mask: Mean (SD) (Standard Deviation) P value
1 min 14.1 (4.6) 14.0 (4.3) 0.75
2 min 14.2 (5.3) 13.4 (4.4) 0.076
3 min 14.9 (5.1) 13.1 (4.7) <  0.0001
4 min 14.2 (4.8) 13.3 (4.3) 0.0024
5 min 13.7 (4.4) 13.4 (4.1) 0.30
  1. FiO2 fraction of inspired oxygen, EtCO2 end-tidal CO2, SD standard deviation, RR respiratory rate