Table 3.

Baseline characteristics for patients with pathological node-negative disease, following 4:1 propensity matching, NCDB 2006–2011

Variable	Overall	Adjuvant chemo (n = 15)	Surgery alone (n = 60)	P-value
Patient characteristics
Age, yrs (IQR)	61 (53, 69.5)	61 (53.5, 70)	61 (53, 68.5)	0.97
Female	38 (50.7%)	6 (40%)	32 (53.3%)	0.53
Race				0.74
White	66 (89.2%)	14 (93.3%)	52 (88.1%)
Black	6 (8.1%)	1 (6.7%)	5 (8.5%)
Other	2 (2.7%)	0 (0%)	2 (3.4%)
Charlson Comorbidity Score				0.9
0	37 (49.3%)	8 (53.3%)	29 (48.3%)
1	31 (41.3%)	6 (40%)	25 (41.7%)
≥2	7 (9.3%)	1 (6.7%)	6 (10%)
Education census tract				0.051
Bottom	10 (13.9%)	2 (13.3%)	8 (14%)
Second	12 (16.7%)	6 (40%)	6 (10.5%)
Third	32 (44.4%)	5 (33.3%)	27 (47.4%)
Top	18 (25%)	2 (13.3%)	16 (28.1%)
Income census tract				0.68
Bottom	11 (15.3%)	3 (20%)	8 (14%)
Second	19 (26.4%)	4 (26.7%)	15 (26.3%)
Third	14 (19.4%)	4 (26.7%)	10 (17.5%)
Top	28 (38.9%)	4 (26.7%)	24 (42.1%)
Insurance status				0.78
Private	38 (50.7%)	7 (46.7%)	31 (51.7%)
Medicare/Medicaid	31 (41.3%)	6 (40%)	25 (41.7%)
Other Government	1 (1.3%)	0 (0%)	1 (1.7%)
Unknown	2 (2.7%)	1 (6.7%)	1 (1.7%)
Uninsured	3 (4%)	1 (6.7%)	2 (3.3%)
Tumor characteristics
Tumor size (mm)	30 (20, 45)	30 (19, 45)	30 (23, 45)	0.87
Pathologic stage				0.55
Stage 1	35 (87.5%)	8 (100%)	27 (84.4%)
Stage 2	5 (12.5%)	0 (0%)	5 (15.6%)
Stage 3	0 (0%)	0 (0%)	0 (0%)
Facility characteristics
Distance traveled (miles, IQR)	11.8 (4.8, 32.6)	9.8 (4.4, 18.1)	11.9 (5.5, 33.6)	0.4
Treatment facility				0.78
Community Program	4 (5.3%)	1 (6.7%)	3 (5%)
Comprehensive Community Program	31 (41.3%)	5 (33.3%)	26 (43.3%)
Academic Program	40 (53.3%)	9 (60%)	31 (51.7%)