High-flow nasal cannula oxygen therapy during anesthesia recovery for older orthopedic surgery patients: A prospective randomized controlled trial

Table 4 Postoperative evaluation of the patients in the conventional mask group and high-flow nasal cannula oxygen group

	Conventional mask group (n = 30), n (%)	HFNCO group (n = 30), n (%)	P value
Patients’ oxygen tolerance score			0.0781
1	29 (96.7)	30 (100)
2	0	0
3	1 (3.3)	0
4	0	0
5	0	0
Airway humidification			0.237
Yes	27 (90)	30 (100)
No	3 (10)	0

¹Fisher’s exact test.

Airway humidification evaluation: “yes” indicates satisfactory airway humidification; “no” indicates unsatisfactory airway humidification. Data are presented as n (%). HFNCO: High-flow nasal cannula oxygen.