Clinical characteristics and risk factors of post-operative intestinal flora disorder following laparoscopic colonic surgery: A propensity-score-matching analysis

Table 1 The baseline characteristics of patients before and after propensity-score-matching, n (%)

Factors	Before PSM				After PSM
	Non-IFD (n = 976)	IFD (n = 97)	χ²	P value	Non-IFD (n = 194)	IFD (n = 97)	χ²	P value
Gender			6.831	0.009			0.000	1.000
Female	426 (43.6)	29 (29.9)			58 (29.9)	29 (29.9)
Male	550 (56.4)	68 (70.1)			136 (70.1)	68 (70.1)
Tumor locations			8.131	0.043			0.000	1.000
Asending colon	402 (41.2)	51 (52.6)			102 (52.6)	51 (52.6)
Transverse colon	63 (6.5)	7 (7.2)			14 (7.2)	7 (7.2)
Descending colon	395 (40.5)	25 (25.8)			50 (25.8)	25 (25.8)
Sigmoid colon	116 (11.8)	14 (14.4)			28 (14.4)	14 (14.4)
Age (yr)			2.060	0.151			0.063	0.801
< 65	499 (51.1)	57 (58.7)			111 (57.2)	57 (58.7)
≥ 65	477 (48.9)	40 (41.3)			83 (42.8)	40 (41.3)
ASA grade			1.336	0.248			0.248	0.619
I-II	888 (84.2)	86 (88.7)			168 (86.6)	86 (88.7)
III-IV	154 (15.8)	11 (11.3)			26 (13.4)	11 (11.3)
CEA			1.212	0.271			1.457	0.227
< 5 ng/mL	715 (73.3)	66 (68.1)			145 (77.7)	66 (68.1)
≥ 5 ng/mL	261 (26.7)	31 (31.9)			49 (22.3)	31 (31.9)
CA19-9			0.039	0.844			1.155	0.282
< 34 U/mL	852 (87.3)	84 (86.6)			176 (90.8)	84 (86.6)
≥ 34 U/mL	124 (22.7)	13 (13.5)			18 (9.2)	13 (13.5)
Hypertension (yes)	316 (32.4)	33 (34.0)	1.109	0.742	63 (32.5)	33 (34.0)	0.070	0.791
DM (yes)	198 (19.9)	18 (18.6)	0.098	0.755	26 (13.4)	18 (18.6)	1.339	0.247
CHD (yes)	98 (10.0)	10 (10.3)	0.007	0.933	10 (5.2)	10 (10.3)	2.685	0.101
Antiplatelet (yes)	89 (9.1)	9 (9.3)	0.003	0.956	10 (5.2)	9 (9.3)	1.802	0.179
Abdominal surgery (yes)	99 (10.1)	12 (12.4)	0.477	0.490	33 (17.1)	12 (12.4)	1.065	0.302

PSM: Propensity score matching; IFD: Intestinal flora disorder; ASA: American society of anesthesiologist; CEA: Carcino embryonic antigen; CA19-9: Carbohydrate antigen 19-9; DM: Diabetes mellitus; CHD: Coronary heart diseases.