Table 3. Characteristics of Patients Relative to Health Services Area Rates of Primary Tumor Resection.

	HSA PTR Rate Quintile					Pa
	1	2	3	4	5
No. of patients	3 804	7 586	17 618	12 671	2 835
PTR rate (average %)	51.4	58.0	63.1	66.1	73.7
Median survival (months)	13	13	12	12	12
Age at diagnosis, y (%)
18–49	13.9	14.8	13.3	13.1	14.2	0.008
50–75	61.1	62.4	62.4	62.6	62.3
76–90	25.0	22.8	24.3	24.2	23.5
Sex (%)
Female	43.1	42.3	43.8	43.1	43.6	0.301
Male	56.9	57.7	56.2	56.9	56.4
Race/ethnicity (%)
White	79.0	78.5	76.9	75.8	88.4	<0.001
Black	16.5	10.1	14.9	12.4	10.4
Asian	3.2	7.8	7.5	10.1	0.9
Others and unknown	1.3	3.6	0.7	1.8	0.2
Marital status (%)
Single	15.6	15.5	15.7	14.4	12.4	<0.001
Married	53.7	53.2	54.1	55.8	59.4
Separated, divorced, or widowed	26.4	27.5	27.3	26.8	26.5
Unknown	4.3	3.9	3.0	3.0	1.7
Tumor grade (%)
Poorly differentiated or undifferentiated	22.5	21.5	23.9	24.8	27.9	<0.001
Well or moderately differentiated	59.3	62.2	60.2	59.7	61.2
Unknown	18.3	16.2	15.9	15.4	10.9
Tumor location (%)
Right colon, including transverse colon	22.0	23.3	24.1	25.3	24.6	<0.001
Left colon	33.9	35.8	36.7	36.8	36.2
Rectosigmoid or rectum	36.0	35.0	33.5	32.4	34.2
Not otherwise specified	8.1	5.9	5.7	5.6	5.0
Year of diagnosis (%)
1988–1991	1.0	2.3	8.6	16.3	14.7	<0.001
1992–1994	0.7	2.0	11.6	11.8	9.9
1995–1997	0.9	2.1	11.3	11.9	11.6
1998–2000	8.7	8.7	12.6	12.3	10.0
2001–2003	28.0	24.5	16.8	13.8	15.7
2004–2006	24.6	25.6	16.6	14.0	15.6
2007–2010	36.1	34.8	22.7	19.8	22.5

Abbreviations: HSA, health service area; PTR, primary tumor resection.

^aχ² test of independence.