Role of carbon nanotracers in lymph node dissection of advanced gastric cancer and the selection of preoperative labeling time

Table 5 Differences in the number of D1 lymph nodes dissected and the number of black stains at different preoperative labeling times in laparoscopic total gastrectomy and laparoscopic subtotal gastrectomy

	Labeling time (d)	Cases	Average number of dissected lymph nodes	Average number of black staining lymph nodes
LTG	0	30	18.87 ± 2.78	11.30 ± 2.42
	1	36	21.86 ± 2.39	14.00 ± 2.29
	2	33	22.27 ± 2.93	14.36 ± 2.45
	P		0.000	0.000
	F		14.385	14.946
LSG	0	16	18.19 ± 2.01	8.15 ± 1.65
	1	34	21.03 ± 3.00	10.82 ± 2.55
	2	31	19.87 ± 1.98	10.81 ± 1.94
	P		0.002	0.000
	F		7.075	9.500

LTG: Laparoscopic total gastrectomy; LSG: Laparoscopic subtotal gastrectomy.