[Retracted] Analysis of the Effects of Humidified High Flow Nasal Oxygen Therapy Combined with Noninvasive Mechanical Ventilation on Treatment Outcomes

Table 4

Comparison of respiratory function between the two groups before and after treatment (x ± s).

Group	n	FEV1 (L)		PEFR (L/s)
		Before treatment	After treatment	Before treatment	After treatment
Research group	50	2.03 ± 0.79	2.63 ± 0.65	3.26 ± 0.89	3.95 ± 0.76
Control group	50	2.05 ± 0.80	2.29 ± 0.62	3.22 ± 0.91	3.60 ± 0.68
t		0.120	2.552	0.212	2.314
		0.905	0.012	0.833	0.023

Note. Compared with before treatment in this group, .