2.

两组患者术后相关资料比较（Mean±SD）

The postoperative clinical data between the two groups (Mean±SD)

	Control group (n=50)	Experimental group (n=50)	P
VAS: visual analogue scale
Total chest drainage (mL)	771.60±32.40	724.80±43.20	0.332
Daily chest drainage (mL)	253.82±12.47	244.86±14.32	0.521
Duration of chest drainage (d)	3.04±1.03	2.96±1.12	0.173
Post-operative hospital day (d)	4.24±0.95	4.12±1.04	0.253
Post-operative VAS score on day 2	2.34±1.27	2.74±1.14	0.43