2.

两组患者围手术期资料比较

Outcome	Single utility port group (n=87)	3-port group (n=75)	t/χ2	P
Operation time (min)	151.03±25.97	156.27±26.49	1.267	0.207
Intraoperative bloodloss (mL)	188.62±47.03	179.60±28.96	1.491	0.138
Postoperative hospital stay (d)	7.18±1.95	7.92±2.03	2.353	0.020
Lymphnode dissection number	13.06±1.36	12.61±1.56	1.918	0.057
Time to first activity out of bed (h)	11.17±8.69	13.76±7.43	2.019	0.045
Chest drainage duration (d)	3.85±1.21	4.43±1.43	2.787	0.006
Postoperative drainage volume (mL)	671.49±178.31	736.93±170.39	2.377	0.019
Postoperative complications	18	21	1.178	0.278
Pulmonary atelectasis	8	6
Arrhythmia	7	10
Persistent air leak (> 5 d)	3	5