[Retracted] Effect of Noninvasive Positive Pressure Ventilation on Prognosis and Blood Gas Level in COPD Patients Complicated with Respiratory Failure

Table 3

Comparison of endotracheal intubation rate, hospitalization time, and mortality.

Groups	Tracheal intubation	Length of stay (d)	Mortality
Regular group (n = 36)	10 (27.78)	20.78 ± 5.03	5 (16.67)
Research group (n = 42)	4 (9.52)	15.12 ± 4.03	1 (2.38)
χ ^2/t	4.386	5.516	3.615
	0.036	<0.001	0.057