[Retracted] The Effect of CT-Guided Artificial Pneumothorax plus Thoracoscopy and Central Venous Catheterization on the Drainage Effect of Pediatric Empyema and Pulmonary Function

Table 5

Comparison of sonographic staging.

Group	Case (n)	Stage 1 (n(%))	Stage 2 (n(%))	Stage 3 (n(%))
Control group	40	9 (22.50)	15 (37.50)	16 (40.00)
Study group	42	7 (16.67)	17 (40.48)	18 (42.85)
t		0.417	0.366	0.528
P		0.871	0.693	0.948