Table 3.

Duration of device usage and causes of reintubation

Variables	NIV (N = 110)	HFNC (N = 112)	Relative risk (95% CI)	P
Duration of device usage, median (IQR), h	24 (19–42)	24 (20–55)		0.18
Interval from extubation to reintubation, median (IQR), h	67 (23–139)	54 (19–282)		0.90
Device protocol compliance rate	105 (95.5)	107 (95.5)	0.99 (0.49–2.01)	0.98
Causes of reintubation, No. (%)
Hypoxia	21 (19.1)	20 (17.9)	0.96 (0.69–1.34)	0.81
Hemodynamic instability	6 (5.5)	4 (3.6)	0.82 (0.48–1.38)	0.50
Cardiac arrest	4 (3.6)	4 (3.6)	0.99 (0.49–2.01)	0.98
Urgent surgery	2 (1.8)	1 (0.9)	0.74 (0.33–1.67)	0.55
Inability to clear secretions	1 (0.9)	4 (3.6)	2.51 (0.43–14.57)	0.18
Altered mental status	1 (0.9)	4 (3.6)	2.51 (0.43–14.57)	0.18
Others	2 (1.8)	1 (0.9)	0.65 (0.38–1.17)	0.50

Calculated using patients who required reintubation (37 in the NIV group and 33 in the HFNC group)

*Calculated using patients who required a device change (20 in the NIV group and nine in the HFNC group)