Application of Montgomery T-Tube Placement in Treating Cotton-Myer IV Subglottic Airway Atresia after Bi-Level Airway Recanalization

Table 3

Indexes of patients before and after surgery.

Index	Before	After	value
Oxygen inhalation (%)			0.001
Yes	8 (72.7)	0 (0.0)
No	3 (27.3)	11 (100)
SpO2 (%)			0.049
Cough or expectoration (%)	10 (90.9)	1 (9.1)	0.003
Breathing difficulty (%)			0.444
Grade 1	1 (9.1)	4 (36.4)
Grade 2	2 (18.2)	1 (9.1)
Grade 3	1 (9.1)	0 (0.0)
Grade 4	1 (9.1)	0 (0.0)