Effect of obesity on post-operative outcomes following colorectal cancer surgery

Table 3 Post-operative outcomes of patients undergoing colorectal cancer surgery

		BMI < 30 (% of group)	BMI ≥ 30 (% of group)	Total	P value
Patients		433	182	615
Post-operative complication (CD grade)	No complication	242 (55.9)	88 (48.4)	330	0.06
	Complication	191 (44.1)	94 (51.6)	285
	I	31 (7.2)	17 (9.3)	48
	II	99 (22.9)	42 (23.1)	141
	IIIa	27 (6.2)	15 (8.2)	42
	IIIb	13 (3.0)	6 (3.3)	19
	IVa	13 (3.0)	10 (5.5)	23
	IVb	0 (0.0)	3 (1.6)	3
	V	8 (1.8)	1 (0.5)	9
	No complication or low-grade complication (CD I-II)	372 (85.9)	147 (80.8)	519	0.11
	High-grade complication (CD IIIa-V)	61 (14.1)	35 (19.2)	96
Any surgical complication		99 (22.9)	48 (26.4)	147	0.35
Specified surgical complications	Abdomino-pelvic collection	16 (3.7)	3 (1.6)	19	0.21
	Anastomotic leak	12 (2.8)	7 (3.8)	19	0.46
	Wound infection	19 (4.4)	7 (3.8)	26	0.83
	Prolonged ileus	49 (11.3)	27 (14.8)	76	0.23
	Post-operative hemorrhage	3 (0.7)	2 (1.1)	5	0.64
	Return to theatre	13 (3.0)	7 (3.8)	20	0.62
	Post-operative sepsis	16 (8.3)	8 (8.6)	24	1.00
Any medical complication		96 (22.2)	37 (20.3)	133	0.67
Specified medical complications	VTE (DVT/PE)	4 (0.9)	2 (1.1)	6	1.00
	Pneumonia	19 (4.4)	8 (4.4)	27	1.00
	Ischemic cardiac event	5 (1.2)	5 (2.7)	10	0.17
	Cardiac arrhythmia	30 (6.9)	9 (4.9)	39	0.47
	Respiratory failure	10 (2.3)	8 (4.4)	18	0.19
	Renal failure	12 (2.8)	7 (3.8)	19	0.46
	Unplanned ICU admission	16 (3.7)	6 (3.3)	22	1.00
Post-operative length of stay (d)		6 (IQR 5-11)	7 (IQR 5-11)		0.42

BMI: Body mass index; CD: Clavien-Dindo; DVT: Deep vein thrombosis; ICU: Intensive care unit; IQR: Interquartile range; PE: Pulmonary embolism; VTE: Venous thrombo-embolism.