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Table 2 Results of FiO2, EtCO2, and RR with or without a surgical mask

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

  Mean (SD) Mean difference (95% CI) P
  With a mask Without a mask   
FiO2 0.56 (0.15) 0.67 (0.08) 0.11 (0.095–0.125) < 0.0001
EtCO2 34.4 (5.9) 26.3 (7.0) 8.1 (7.2–8.9) < 0.0001
RR 13.7 (4.4) 13.4 (4.1) 0.31(−1.52 ~ 0.89) 0.19
  1. P-values from repeated measures analysis of variance (ANOVA)
  2. FiO2 fraction of inspired oxygen, EtCO2 end-tidal CO2, SD standard deviation, CI confidence interval, RR respiratory rate