Table 4. Characteristics of non-invasive ventilation outcomes.

Characteristic	NIV success (n=69)	NIV failure (n=43)	P value	Odds ratio of NIV failure (95% CI)
NIV therapy, h	21 (4.5–39.0)	20 (4.0–70.0)	0.726	–
No. of ICU days	6.68 (4.72–10.91)	17.23 (10.07–31.83)	<0.0001	–
Tracheostomy, n (%)	0 (0)	17 (39.5)	<0.0001	1.654 (1.299–2.106)
In-hospital mortality, n (%)	1 (1.4)	19 (44.2)	<0.0001	1.766 (1.351–2.307)

Data were presented as median (interquartile range), categorical variables were presented as number (%). CI, confidence interval; h, hours; ICU, intensive care unit; NIV, non-invasive ventilation.