Table 2.

Baseline characteristics of neoadjuvant chemoradiation-treated stage I–III rectal cancer patients and the proportion with adjuvant chemotherapy initiated (N=1,492)

Characteristics	Patients		Proportion initiating adjuvant chemotherapy within 6-month after surgery, %
	N	Column %
Overall	1,492	100	61.5
Age at diagnosis, yrs			P=0.001
66–70	567	38	67.4
71–75	555	37.2	58.9
76–80	370	24.8	56.5
Gender			P=0.652
Male	879	58.9	62.0
Female	613	41.1	60.8
Race/ethnicity			P=0.461
White	1,340	89.8	61.1
Black	65	4.4	61.5
Other/unknown	87	5.8	67.8
Composite social-economic status, quartile			P=0.039
Top	373	25	67.8
2nd	373	25	59.5
3rd	373	25	59.8
Bottom	373	25	59
Residence			P=0.246
Big Metro	782	52.4	64.1
Metro	423	28.4	59.1
Urban	99	6.6	55.6
Less Urban	136	9.1	58.1
Rural	52	3.5	63.5
Post-therapy pathologic stage			P<0.001
I	294	19.7	48.3
II	502	33.6	59.6
III	366	24.5	77.6
Unknown	330	22.1	58.5
Grade			P=0.160
Well and moderately differentiated	1,069	71.6	61.5
Poorly differentiated and undifferentiated	226	15.1	65.9
Unknown	197	13.2	56.9
Comorbidity index			P=0.169
0	1,037	69.5	63
1	341	22.9	59.2
2+	114	7.6	55.3
Postoperative readmission			P<0.001
No	1310	87.8	63.9
Yes	182	12.2	43.9
Year of diagnosis			P=0.044
1998–1999	142	9.5	57.7
2000–2001	296	19.8	56.4
2002–2003	343	23	59.8
2004–2005	361	24.2	63.4
2006–2007	350	23.5	67.1
Type of surgery			P=0.010
APR	596	39.9	58.9
LAR	658	44.1	63.5
Other surgery*	238	16.0	51.1
SEER region			P=0.075
West	589	39.5	59.4
Midwest	225	15.1	60.4
Northeast	345	23.1	67.5
South	333	22.3	59.8

^*Other unspecified resection of large intestine