Table 2.

Characteristics of patients in included studies

Author and year of publication		Patients enrolled	Age mean (SD)	Sex (M/F)	BMI mean (SD)	ASA (I, II, III, IV)	T stage (I, II, III, IV)
Feng 2021	High ligation	47	60.5 ± 10.2	26/21	22.6 ± 2.3	NR	TNM: 21, 12, 14, 0
	Low ligation	48	59.8 ± 8.9	24/24	22.9 ± 2.7	NR	TNM: 25, 13, 10, 0
Kruszewski et al. (2021)	High ligation	65	64 ± 9	37/28	27 ± 4	NR	TNM (0, I, II, III, IV): 10, 22, 14, 19, 0
	Low ligation	65	65 ± 8.5	34/31	27 ± 4	NR	TNM (0, I, II, III, IV): 7, 16, 18, 24, 0
Fiori et al. (2020)	High ligation	22	68 ± 9	12/10	NR	0, 18, 4, 0	TNM: 22, 0, 0, 0
	Low ligation	24	68 ± 11	14/10	NR	1, 16, 7, 0	TNM: 24, 0, 0, 0
Mari et al. (2020)	High ligation	111	67 ± NR	65/46	26.7 ± 4.6	NR	TNM: 44, 25, 39, 3
	Low ligation	103	68 ± NR	63/40	26.1 ± 3.9	NR	TNM: 60, 21, 19, 3
Fujii et al. (2019)	High ligation	107	66 ± NR	68/39	23.1 ± NR	29, 74, 4, 0	TNM (0, I, II, III, IV): 3, 45, 20, 36, 3
	Low ligation	108	66 ± NR	68/40	22.3 ± NR	53, 95, 12, 0	TNM (0, I, II, III, IV): 5, 43, 20, 36, 4
Guo et al. (2019)	High ligation	29	NR	NR	NR	NR	NR
	Low ligation	28	NR	NR	NR	NR	NR
Matsuda et al. (2017)	High ligation	51	69 ± NR	33/18	NR	NR	TNM (0, I, II, III, IV): 2,7,15,23,4
	Low ligation	49	67 ± NR	34/15	NR	NR	TNM (0, I, II, III, IV): 0, 17, 17, 13, 2
Niu et al. (2016)	High ligation	45	49.9 ± 8.2	25/20	NR	NR	TNM: 14, 22, 9, 0
	Low ligation	52	51.3 ± 6.3	27/24	NR	NR	TNM: 19, 25, 8, 0
Wang et al. (2015)	High ligation	63	56.8 ± 14.2	NR	NR	NR	NR
	Low ligation	65	58.6 ± 13.7	NR	NR	NR	NR
Wu (2017)	High ligation	50	58.4 ± 9.3	NR	NR	NR	NR
	Low ligation	46	59.1 ± 9.1	NR	NR	NR	NR
Zhou et al. (2018)	High ligation	52	52.7 ± 12.9	NR	NR	NR	NR
	Low ligation	52	53.9 ± 14.5	NR	NR	NR	NR