Computed tomography-guided catheter drainage with urokinase and ozone in management of empyema

Table 1 Comparison of preadmission variables among treatment groups

Variable	Group I	Group II	Group III
Patients, n	63	64	82
Average age in years	36.7 (14.3)	29.6 (12.6)	38.2 (19.1)
Duration of symptoms in days	12.4 (8.2)	14.8 (6.3)	13.7 (5.9)
Initial WBC, × 103	16.4 (8.8)	16.9 (7.6)	17.1 (8.7)
Total lymphocytes, × 103	13.2 (6.9)	14.4 (7.4)	14.7 (7.3)

Data are presented as mean (SD). WBC: White blood cell count.

Table 2 Comparison of hospitalization and outcome variables among treatment groups

Variable	Group I	Group II	Group III
Technical success of catheter placement	100%	100%	100%
Success rate of management	62%	83%	95%
Length of hospital stay in days	21.0 (7.4)	19.4 (5.7)	12.8 (5.4)
Duration of fever in days	4.2 (3.0)	3.7 (2.6)	2.1 (1.8)
Converted into further surgery	8 (32%)	8 (25%)	5 (12%)
Average hospital charges in RMB¥	25057	19814	15871

Data are presented as mean (SD) or n (%).