Usefulness of the endoscopic surgical skill qualification system in laparoscopic colorectal surgery: short-term outcomes: a single-center and retrospective analysis

Table 3 Operative and postoperative results before and after PSM

Before PSM	QS n?=?170	NQS n?=?50	p value	QS n?=?43	NQS n?=?43	p value
Operation time (min)	213.4	291.7	0.0001*	221.6	304.6	0.0007*
Blood loss (ml)	25.52	45.54	0.0488*	17.47	48.6	0.0436*
Conversion	0% (n?=?0)	8% (n?=?4)	0.0002*	0% (n?=?0)	6.98% (n?=?3)	0.0779
Harvested lymph nodes	20.19	12.42	0.0001*	18.74	12.44	0.003*
Complications	25.29% (n?=?43)	28% (n?=?14)	0.7011	27.91% (n?=?12)	25.58% (n?=?11)	0.8075
Clavien–Dindo
I	15.29% (n?=?26)	18% (n?=?9)	0.6456	18.6% (n?=?8)	16.28% (n?=?7)	0.7763
II	7.65% (n?=?13)	6% (n?=?3)	0.6934	4.65% (n?=?2)	6.98% (n?=?3)	0.6449
IIIa	1.76% (n?=?3)	2% (n?=?1)	0.9128	4.65% (n?=?2)	2.33% (n?=?1)	0.5567
IIIb	0.58% (n?=?1)	2% (n?=?1)	0.3552	0% (n?=?0)	0% (n?=?0)	1
Hospital stay after surgery (day)	13.15	13.78	0.6057	12.56	13.63	0.3618
Lymph node dissection level			0.0008*			0.3833
D0	3.53% (n?=?6)	6% (n?=?3)	0.4382	2.33% (n?=?1)	6.98% (n?=?3)	0.3068
D1	2.35% (n?=?4)	4% (n?=?2)	0.5296	0% (n?=?0)	2.33% (n?=?1)	0.3145
D2	10% (n?=?17)	32% (n?=?16)	0.0001*	18.6% (n?=?8)	25.58% (n?=?11)	0.4355
D3	82.35% (n?=?143)	58% (n?=?29)	0.0001*	79.07% (n?=?34)	65.12% (n?=?28)	0.1492

ISSN: 1471-2482