Variable Conventional NIV Group (n=42) Immediate NIV Group (n=37) Difference between groups (95%IC) P value
FIO2
Pre-Intervention 0,45 ± 0,11 0,49 ± 0,09 0,04 (-0,1 to +0,2) 0,67
Post-Intervention 0,43 ± 0,7 0,30 ± 0,10 0,13 (+0,05 to +0,22) 0,01
One day later 0,40 ± 0,09 0,30 ± 0,05 0,1 (+0,03 to +0,3) 0,04
PaO2 (mmHg)
Pre-Intervention 91 ± 15 90 ± 14 1 (-3 to +4) 0,76
Post-Intervention 82 ± 12 80 ± 16 2 (-4 to +5) 0,68
One day later 84 ± 11 81 ± 14 3 (-7 to +8) 0,67
PaO2/FIO2
Pre-Intervention 202 ± 34 183 ± 48 19 (-11 to +28) 0,12
Post-Intervention 191 ± 45 266 ± 29 75 (+45 to +91) <0,001
One day later 210 ± 39 279 ± 37 69 (+33 to +82) <0,001
PaCO2 (mmHg)
Pre-Intervention 37 ± 5 39 ± 4 2 (-4 to +5) 0,78
Post-Intervention 41 ± 6 42 ± 3 1 (-4 to +3) 0,87
One day later 40 ± 4 40 ± 2 0 (-2 to +2) 0,91