Table 3.

Patient-, tumor-, and treatment-related factors of patients who underwent surgery and observation matched to patients who underwent surgery and adjuvant chemoradiotherapy.

	Surgery + observation n (%)	Surgery + ACRT n (%)	P	S diff
Number of patients	568	568
Gender			.76	0.02
Male	301 (53.0)	306 (53.9)
Female	267 (47.0)	262 (46.1)
Age (mean +/− SD years)	63.9 (10.8)	63.9 (9.8)	.86	<0.01
Ethnicity			.91	<0.01
Non-Hispanic	525 (92.4)	524 (92.3)
Hispanic	43 (7.6)	44 (7.7)
Insurance status			.83
Not insured	19 (3.4)	21 (3.7)		0.02
Private	245 (43.1)	252 (44.4)		0.02
Medicaid	36 (6.3)	40 (7.0)		0.03
Medicare	259 (45.6)	247 (43.5)		0.04
Other government	9 (1.6)	8 (1.4)		0.01
Median income of residence			.64	0.03
Below median	249 (43.8)	241 (42.4)
Above median	319 (56.2)	327 (57.6)
Charlson/Deyo score			.41	0.05
0	391 (68.8)	404 (71.1)
≥1	177 (31.2)	164 (28.9)
pT			.78
1	38 (6.7)	42 (7.4)		0.03
2	146 (25.7)	151 (26.6)		0.02
3	220 (38.7)	200 (35.2)		0.07
4	164 (28.9)	175 (30.8)		0.04
pN			.33	0.04
N0	149 (26.2)	160 (28.2)
N+	419 (73.8)	408 (71.8)
Grade
Well/moderately differentiated	336 (59.2)	341 (60.0)
Poorly/undifferentiated	232 (40.9)	227 (40.0)
Year			.62
2004–2005	111 (19.5)	113 (19.9)		<0.01
2006–2007	118 (20.8)	110 (19.4)		0.04
2008–2009	91 (16.0)	108 (19.0)		0.08
2010–2011	121 (21.3)	124 (21.8)		0.01
2012–2013	127 (22.4)	113 (19.9)		0.06
Facility type			>.99	<0.01
Academic	303 (53.4)	303 (53.4)
Non-academic	265 (46.6)	265 (46.6)
Margin status			.79	0.01
Negative	533 (93.8)	535 (94.2)
Positive	35 (6.2)	33 (5.8)
Length of stay (mean +/− SD days)	12.1 (8.7)	11.4 (9.7)	.08	0.09
30-day readmission			.91	<0.01
No	530 (93.3)	529 (93.1)
Yes	38 (6.7)	39 (6.9)

ACRT = adjuvant chemoradiotherapy; S diff = standardized differences; SD = standard deviation.