TABLE 1.

Comparison of Oxygen Saturation, FRC, and Respiratory Mechanics in the Prone and Supine Postures

ProneSupineP Value
Oxygen saturation (%)
 Oxygen-dependent96 (94–97)95 (94–95).015
 Nonoxygen-dependent96 (94–98)95 (95–98).25
FRC (mL/kg)
 Oxygen-dependent25 (14–36)23 (13–32).019
 Nonoxygen-dependent27 (19–39)26 (17.7–35).06
Crs (mL/cm H2O/kg)
 Oxygen-dependent0.8 (0.2–1.6)0.6 (0.4–1.4).43
 Nonoxygen-dependent1.1 (0.7–1.4)1.0 (0.4–1.5).37
Rrs (cm H2O/L/sec)
 Oxygen-dependent132 (98–195)131.3 (87–195).62
 Nonoxygen-dependent119 (67–207)120 (89–166)1.0
  • The data are displayed as median (range).