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

Table 5 Operative and postoperative results in QSA and NQS groups before and after PSM

Before PSM	QSA n = 52	NQS n = 50	p value	QSA n = 33	NQS n = 33	p value
Operation time (min)	217.48	291.7	0.0002*	224.3	272.24	0.0481*
Blood loss (ml)	22.9	45.54	0.0934	26.55	40.3	0.3838
Conversion	0% (n = 0)	8% (n = 4)	0.0194*	0% (n = 0)	9.09% (n = 3)	0.0763
Harvested lymph nodes	20.48	12.42	0.0004*	19.97	13.15	0.0163*
Complications	19.23% (n = 10)	28% (n = 14)	0.2966	24.24% (n = 8)	24.24% (n = 8)	1
Clavien–Dindo
I	7.69% (n = 4)	18% (n = 9)	0.1186	12.12% (n = 4)	18.18% (n = 6)	0.4923
II	7.69% (n = 4)	6% (n = 3)	0.7354	6.06% (n = 2)	3.03% (n = 1)	0.5546
IIIa	1.92% (n = 1)	2% (n = 1)	0.9777	3.03% (n = 1)	3.03% (n = 1)	1
IIIb	1.92% (n = 1)	2% (n = 1)	0.9777	3.03% (n = 1)	0% (n = 0)	0.3136
Hospital stay after surgery (day)	12.98	13.78	0.1967	12.7	13.55	0.63
Lymph node dissection level			0.0439*			0.267
D0	5.77% (n = 3)	6% (n = 3)	0.9605	3.03% (n = 1)	6.06% (n = 2)	0.5546
D1	3.85% (n = 2)	4% (n = 2)	0.9681	3.03% (n = 1)	3.03% (n = 1)	1
D2	9.62% (n = 5)	32% (n = 16)	0.0052*	12.12% (n = 4)	30.3% (n = 10)	0.0708
D3	80.77% (n = 42)	58% (n = 29)	0.0124*	81.82% (n = 27)	60.61% (n = 20)	0.057

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