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Table 2 Respiratory mechanics and gas exchange of the study population during supine position and prone position

From: Awake prone position reduces work of breathing in patients with COVID-19 ARDS supported by CPAP

  Supine
N = 40
Prone
N = 40
p Mean difference [95% CI]
Respiratory rate, bpm 20 [17 to 24] 17 [15 to 19]  < 0.001 − 3 [− 4 to − 2]
Tidal volume, ml 431 [359 to 498] 424 [379 to 481] 0.478 − 11 [− 43 to − 21]
Tidal volume, ml/kg 6.9 [6.0 to 7.9] 6.9 [5.7 to to 7.9] 0.517 − 0.16 [− 0.65 to 0.33]
Minute ventilation, l/min 8.6 [7.3 to 10.6] 7.7 [6.6 to 8.6]  < 0.001 − 1.4 [− 1.9 to − 0.8]
PaO2/ FiO2 ratio, mmHg 166 [136 to 224] 314 [232 to 398]  < 0.001 138 [108 to 169]
PaO2, mmHg 114 [90 to 141] 206 [143 to 270]  < 0.001 95 [74 to 116]
PaCO2, mmHg 38 [3 to 42] 39 [37 to 41] 0.029 1.3 [0.1 to 2.5]
Ventilatory ratio 1.4 [1.3 to 1.6] 1.3 [1.1 to 1.5]  < 0.001 − 0.16 [− 0.25 to − 0.07]
Estimated dead-space fraction, % 41 [3 to 49] 32 [23 to 39]  < 0.001 − 9 [− 14 to − 5]
  1. CI confidence interval, bpm breaths per minute
  2. Data are presented as median [interquartile range] for continuous values unless otherwise specified
  3. Supine Position taken as reference