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

Table 2

Comparison of clinical efficacy (n (%)).

Groups	Markedly effective	Effective	Ineffective	Total effective rate
Regular group (n = 36)	12 (33.33)	18 (50.00)	6 (16.67)	30 (83.33)
Research group (n = 42)	22 (66.67)	19 (45.24)	1 (2.38)	41 (97.62)
χ ^2	—	—	—	4.843
	—	—	—	0.028