Table 2

Awake prone positioning effect on SpO2/FiO2, by patient and by episode

VariableNBefore proningAfter proningP value
S/F ratio by all episodes—median (IQR), mean (SD)42153 (131–188), 159 (43)158 (150–233), 177 (45)0.08
S/F ratio by patient—median (IQR), mean (SD)10157 (150–187), 164 (34)193 (155–234), 192 (46)0.14
S/F ratio by episode:
Episode 1—median (IQR), mean (SD)10153 (135–185), 161 (33)192 (156–234), 197 (50)0.04
Episode 2—median (IQR), mean (SD)7152 (131–173), 155 (44)158 (153–176), 170 (33)0.44
Episode 3—median (IQR), mean (SD)5153 (152–155), 147 (37)150 (148–157), 150 (31)0.92
Episode 4—median (IQR), mean (SD)5153 (127–157), 144 (36)150 (134–160), 162 (46)0.75
Episode 5—median (IQR), mean (SD)5152 (139–153), 156 (56)163 (157–165), 165 (47)0.35
Episode 6—median (IQR), mean (SD)4195 (143–236), 184 (64)196 (149–233), 186 (57)0.78
Episode 7—median (IQR), mean (SD)3157 (137–197), 171 (62)157 (140–197), 173 (59)0.82
Episode 8—median (IQR), mean (SD)3230 (180–235), 174 (58)233 (187–234), 203 (53)0.83