Table 2.

Multivariable analysis for independent factors associated with patients who undergo completion axillary lymph node dissection after 1–2 positive sentinel lymph nodes

Outcome event = SLNB + ALND		N=9157
	Percent (%)	OR	95% CI	p-Value
Facility Type
Academic/research program	30.27	reference	reference	reference
Community cancer program	10.60	1.67	1.43–1.96	<0.001
Comprehensive community cancer program	49.06	1.31	1.17–1.46	<0.001
Other	10.07	1.17	0.97–1.41	0.11
Facility location
New England	6.81	reference	reference	reference
Middle Atlantic region	16.07	1.44	1.16–1.79	<0.001
South Atlantic region	21.69	1.25	1.02–1.54	0.04
East North Central region	19.27	1.53	1.24–1.88	<0.001
East South Central region	4.63	1.21	0.92–1.60	0.18
West North Central region	7.79	1.39	1.09–1.77	0.009
West South Central region	5.02	1.44	1.10–1.88	0.008
Mountain region	5.57	1.07	0.81–1.40	0.64
Pacific region	13.15	0.91	0.72–1.14	0.4
Age at diagnosis (years)
40–49	17.27	reference	reference	reference
50–59	29.77	0.87	0.76–0.99	0.04
60–69	31.73	0.91	0.79–1.04	0.15
70–79	16.59	0.86	0.73–1.00	0.05
≥80	4.64	0.57	0.44–0.73	<0.001
Race
White	77.89	reference	reference	reference
Black	9.92	1.25	1.07–1.46	0.004
Hispanic	5.55	1.23	1.00–1.51	0.05
Asian/Pacific	3.20	0.83	0.62–1.10	0.2
Other or Unknown	3.44	0.88	0.68–1.14	0.33
Year of diagnosis
2012	52.08	reference	reference	reference
2013	47.92	0.75	0.69–0.82	<0.001
Number of positive nodes
1	82.07	reference	reference	reference
2	17.93	2.31	2.06–2.58	<0.001