TABLE 1.

Characteristics of the study population of colorectal cancer patients, adjusted risk of development of post-operative complications and death among with at least one complication

	Complication (n = 35,946)				30-Day postoperative mortality (n = 10,001)
	%	aOR	95 %	CI	%	aOR	95 %	CI
Sociodemographic characteristics
Poverty rate (%)
<10	58.5	1.00		56.0	1.00
10–19	25.4	1.06	1.00	1.14	26.1	1.21	1.03	1.42
20+	15.6	1.06	0.98	1.15	17.4	1.25	1.02	1.53
Sex
Male	42.7	1.15	1.09	1.21	43.8	1.42	1.24	1.63
Female	57.4	1.00			56.2	1.00
Race
White	86.3	1.00			85.7	1.00
African-American	7.1	1.09	0.98	1.21	8.5	0.87	0.67	1.14
Other	6.6	0.70	0.62	0.78	5.8	0.85	0.62	1.16
Comorbidity
0	43.0	1.00			31.7	1.00
1	29.3	1.39	1.31	1.48	29.0	1.09	0.93	1.29
2+	27.7	2.31	2.17	2.45	39.3	0.97	0.83	1.14
Medicaid
Yes	15.9	1.38	1.29	1.49	20.8	0.95	0.80	1.13
No	86.1	1.00			79.2	1.00
Age
66–74	35.7	1.00			27.7	1.00
75–84	45.8	1.41	1.33	1.49	46.4	1.57	1.30	1.89
85+	18.6	2.15	2.01	2.31	25.9	3.04	2.50	3.71
Year
2000	16.3	1.00			15.4	1.00
2001	16.8	1.06	0.96	1.16	16.4	0.97	0.77	1.22
2002	16.8	1.06	0.96	1.16	16.3	0.85	0.67	1.08
2003	17.5	1.13	1.04	1.24	17.7	0.85	0.68	1.06
2004	16.8	1.19	1.09	1.30	17.8	0.83	0.67	1.05
2005	15.8	1.13	1.03	1.23	16.4	0.75	0.60	0.95
Hospital and surgeon characteristics
Beds
1–199	25.2	1.00			25.0	1.00
200–349	28.6	1.00	0.91	1.09	28.5	0.89	0.72	1.08
350–499	23.8	1.03	0.93	1.14	23.6	0.90	0.71	1.13
500+	22.4	1.06	0.94	1.19	22.9	0.80	0.61	1.05
Teaching
Yes	49.7	1.00			49.8	1.00
No	35.4	1.00	0.92	1.09	35.5	1.16	0.96	1.40
Unknown	14.9	0.89	0.89	1.09	14.7	1.24	0.98	1.57
Surgeon case load
<21	22.9	1.14	1.05	1.23	24.9	1.21	0.98	1.50
21–38 1	22.7	1.08	0.99	1.17	23.3	1.06	0.86	1.31
39–69	22.1	0.97	0.90	1.05	20.8	1.10	0.88	1.37
70+	23.0	1.00			21.2	1.00
Unknown	9.5				9.8
Tumor characteristics
AJCC stage
I	26.4	1.00			21.8	1.00
II	39.9	1.28	1.19	1.36	43.5	1.70	1.33	1.86
III	33.7	1.20	1.12	1.29	34.8	1.52	1.24	1.86
Grade
Well differentiated	8.8	1.00			8.3	1.00
Moderately	68.1	1.00	0.91	1.09	67.5	0.97	0.74	1.27
Poorly	18.7	1.05	0.94	1.16	19.7	1.23	0.91	1.65
Undifferentiated	1.0	1.33	1.03	1.72	1.2	1.42	0.77	2.60
Unknown	3.5	1.03	0.87	1.21	3.3	0.93	0.59	1.47
Location
Proximal colon	40.7	0.79	0.72	0.87	38.6	1.43	1.09	1.87
Transverse colon	15.4	0.96	0.87	1.06	16.8	1.47	1.11	1.93
Distal colon	25.5	1.02	0.94	1.11	27.0	1.59	1.25	2.03
Rectal	18.4	1.00			17.6	1.00
Histology
Mucinous adenocarcinoma	86.6	1.00			86.0	1.00
Other adenocarcinoma	12.9	1.02	0.94	1.10	13.4	1.03	0.85	1.24
Non-adeno/unknown	0.5	1.34	0.97	1.87	0.7	1.07	0.52	2.22
Treatment characteristics
Emergency surgery
Yes	22.2	2.16	2.04	2.29	33.9	1.69	1.48	1.94
No	77.8	1.00			66.2	1.00
Type of surgery
Partial colectomy	43.2	1.00			42.8	1.00
Subtotal colectomy/hemicolectomy	55.7	1.03	0.97	1.11	52.5	0.89	0.76	1.05
Total (procto) colectomy	4.1	1.31	1.16	1.50	4.7	1.10	0.78	1.56

aOR adjusted odds ratio, 95 % CI 95 % confidence interval