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

Table 1 Demographic and co-morbidity characteristics of patients undergoing colorectal cancer surgery

		BMI < 30 (% of group)	BMI ≥ 30 (% of group)	Total	P value
Patients		433	182	615
Age		71 (58.0-79.0)	70 (60.0-77.0)		0.45
Sex	Male	232 (53.6)	83 (45.6)	315	0.08
	Female	201 (46.4)	99 (54.4)	300
ASA grade	Low (ASA 1-2)	198 (45.7)	54 (29.7)	252	< 0.001
	High (ASA ≥ 3)	235 (54.3)	128 (70.3)	363
Any cardiac comorbidity		246 (56.8)	133 (73.1)	379	< 0.001
Specified cardiac comorbidity	Ischemic heart disease	79 (18.2)	37 (20.3)	116	0.57
	Coronary artery bypass graft	25 (5.8)	16 (8.8)	41	0.21
	Coronary stents	25 (5.8)	15 (8.2)	40	0.28
	Pacemaker	8 (1.8)	5 (2.7)	13	0.54
	Valve replacement	19 (4.4)	4 (2.2)	23	0.25
	Heart failure	19 (4.4)	9 (4.9)	28	0.83
	Hypertension	186 (43.0)	117 (64.3)	303	< 0.001
	Atrial fibrillation	54 (12.5)	29 (15.9)	83	0.25
Any respiratory comorbidity		116 (26.8)	68 (37.4)	184	0.01
Specified respiratory comorbidity	Asthma	41 (9.5)	27 (14.8)	68	0.07
	Chronic obstructive pulmonary disease	52 (12.0)	20 (11.0)	72	0.78
	Bronchiectasis	6 (1.4)	3 (1.6)	9	0.73
	Obstructive sleep apnea	10 (2.3)	26 (14.3)	36	< 0.001
Any metabolic comorbidity		158 (36.5)	182 (100.0)	340	< 0.001
Specified metabolic comorbidity	Type 1 diabetes mellitus	3 (0.7)	0 (0.0)	3	0.56
	Type 2 diabetes mellitus	55 (12.7)	52 (28.6)	107	< 0.001
	Hyperlipidemia	116 (26.8)	59 (32.4)	175	0.17
Current smoker		67 (15.5)	25 (13.8)	92	0.71
Alcohol > 2 standard drinks/d		44 (10.2)	13 (7.1)	57	0.29

ASA: American Society of Anesthesiologists; BMI: Body mass index.