Table 3 Independent predictors of NIV failure in patients with acute respiratory failure

Past history of NIV failure

Present

2.79

1.16

.0163

16.22 (1.67–157.51)

Initial respiratory rate

37/min

0.14

0.06

.0175

1.15 (1.03–1.3)

pH at 1–2 h

7.28

 − 34.57

11.17

.0020

0 (0–0)

pCO₂ at 1–2 h

77 mm hg

 − 0.05

0.03

0.1350

0.95 (0.89–1.02)

Sodium

131.5 mEq/L

 − 0.15

0.05

.0043

0.86 (0.77–0.95)