Table II.

Summary of the clinical data included in each selected publication.

								Clinical stage (n)			Pathological grading (n)		CRC type		Surgery
Author/(Ref), year	Location	Control (n)	Benign (n)	CRC (n)	M (n)	F (n)	Age	I	II	III	Low diff.	Medium/high diff.	Colon	Rectum	Before	After
An et al (36), 2016	Southwest	33		45	45		31-76			45			24	21	13	13
Huo et al (41), 2015	East China	32	35	76	51	25	36-83			76			76
Li (46), 2012	Southwest	120	100	120	78	42	31-80			120			60	60	120	120
Li and Wang (49), 2009	East China	48	45	108	79	29	31-78			108				108
Liu et al (40), 2015	South China	600	137	65	65		22-67			65			65
Lu et al (44), 2014	South China	40	61	77	43	34	38-88			77			38	39
Shen et al (47), 2011	East China	60	50	43	28	15	30-79			43			21	22	43	43
Tian et al (48), 2010	East China	33		66	45	21	25-72			66			66		66	66
Xia et al (39), 2015	East China	41		61	33	28	23-85			61	43	18	61		16	16
Qi et al (45), 2013	East China	45		104	104		32-81			104			52	52
Zeng and Zhang (38), 2015	East China		103	133	77	56	32-84			133			133
Zhang et al (42), 2015	Huazhong	40	36	150	88	62	30-78			150			150		150	150
Zhang et al (43), 2014	East China	161		64	64		35-84			64			35	29
Zhu et al (35), 2017	Huazhong	52	162	82	49	33	36-68	17		65	34	48		82
Zhu et al (37), 2015	East China	67		33	33		16-85	7	8	18				33	33	33
Fan et al (30), 2019	Northwest	60	45	50	23	27	60-70			50	31	19	50
Jiang et al (32), 2018	East China	70		71	50	21	32-82	9	26	36	18	53	22	49
Weng (31), 2018	South China	64		64	36	28	42-73	15	29	20				64
Sun et al (33), 2018	Northeast	60		80	50	30	24-80			80	54	26	80
Ning et al (34), 2018	South China	75		344	344			132		212			177	167
Total number		1,701	774	1,836	1,385	451		180	63	1,593	180	164	1,110	726	441	441
Age distribution		16-85	35-84				23-85								30-85	30-85

CRC, colorectal cancer; M, male; F, female; diff., differentiation.