Table 3. Post-operative index comparison between two groups.

Chest tube (days)	Drainage time ≤2 days (N=429)	SD/%	Drainage time >2 days (N=429)	SD/%	P
Intraoperative bleed					0.238
Mean	57.11	183.87	77.63	267.76
Tumor diameter					0.311
Mean	2.97	1.58	3.09	1.69
Total drainage					0.000
Mean	489.8	295.01	982.04	511.89
Days in hospital					0.000
Mean	5.05	2.27	7.17	3.03
Anesthesia					0.599
I-VATS	375	87.4	380	88.6
NI-VATS	54	12.6	49	11.4
Tube					0.000
One	371	86.5	331	77.2
Two	58	13.5	98	22.8
Complications					0.005
Surgery again	0	0	5	1.2
Thoracentesis	5	1.2	4	0.9
Lung infection	1	0.2	10	2.3
Pleural effusion	20	4.7	17	4.0
Nothing	399	93.0	391	91.1

SD, standard deviation; NI-VATS, non-intubated video-assisted thoracoscopic surgery; I-VATS, intubated video-assisted thoracoscopic surgery;