Table 4.

Univariate analysis of risk factors of complications (Yes/No)

Variable	Complications (N = 122)	No complications (N = 927)	χ2	P value
Age ≥ 60 years	58/64	301/626	10.88	< 0.01
BMI < 18 kg/m2	7/115	92/835	2.21	0.14
BMI ≥ 25 kg/m2	23/99	115/812	3.92	0.04
Co-morbidity	50/72	254/673	9.67	< 0.01
Complications	34/88	236/691	0.33	0.57
ASA ≥ 3	33/89	154/773	8.02	< 0.01
History of abdominal surgery	10/112	88/839	0.21	0.64
New adjuvant chemotherapy	3/119	33/894	0.39	0.79
Anemia (hemoglobin < 100 g/L)	30/92	201/726	0.53	0.47
Preoperative albumin < 30 g/L	14/108	78/849	1.26	0.26
Additional surgery#	6/116	32/895	0.66	0.42
Total gastrectomy	18/104	152/775	0.21	0.64
Combined resection	24/98	43/884	40.75	< 0.01
Laparoscopically-assisted	8/114	50/877	0.28	0.60
TNM Stage ≥ III	78/44	543/384	1.28	0.26
Surgical time ≥ 240 min	63/59	260/667	28.16	< 0.01
Blood loss ≥ 300 ml	49/73	239/688	11.20	< 0.01
Preoperative blood transfusion	17/105	92/835	1.86	0.17
Intra-operative blood transfusion	21/101	101/826	4.19	0.04
Postoperative blood transfusion	29/93	99/828	17.25	< 0.01
Perioperative blood transfusion	49/73	207/720	18.59	< 0.01

ASA (American Society of Anesthesiologists).

^#Cholecystectomy (n = 23), oophorocystectomy (n =7), myomectomy (n = 3), hepatic hemangioma resection (n = 3), single nephrectomy (n = 1), anterior resection of rectum (n = 1).