[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 4

Comparison of the size of the effusion.

Group	Case (n)	Grade 1 (n(%))	Grade 2 (n(%))	Grade 3 (n(%))
Control group	40	9 (22.50)	13 (32.50)	18 (45.00)
Study group	42	11 (26.19)	15 (35.71)	16 (38.10)
t		0.383	0.218	0.636
P		0.558	0.719	0.662