Table 3.

Multivariate analyses

	Census Sample (N = 1000)
Dependent Variable = lymph node dissection	OR	SE	p
Surgical Treatment
Breast Conserving Surgery	0.02	0.01	0.000
Mastectomy/Reconstruction
Referent	1.00
Implant	0.58	0.21	0.13
Autogenous	3.71	2.02	0.02
Unknown	3.67	3.85	0.22
Census Tract
Percent below poverty	0.98	0.009	0.04
Site * Treatment Interactions
BCS	0.20	0.12	0.007
Mastectomy with autogenous reconstuction	0.12	0.08	0.003
Calendar Time
Year	0.44	0.08	0.000
Year^2	1.04	0.01	0.000
Site
Site * Year < 1995 (early period)	3.57	2.05	0.026
Site * Year > 1994 (late period)	1.19	0.45	0.64
Insurance Coverage (Referent = Medicare)
Private*Φ(1− ((t−1995)/2) (early period)	3.36	1.36	0.003
Private*Φ((t−1995)/2) (late period)	1.27	0.51	0.55
(Private+Medicare)*(1−Φ((t−1997)/1.2) (early period)	4.25	2.43	0.01
(Private+Medicare)* Φ((t−1997)/1.2) (late period)	0.63	0.39	0.45
Medicaid/uninsured/other	0.90	0.76	0.90
Unknown	1.18	0.59	0.75
Goodness of Fit Statistics
Wald test of Significance of Model	311.480		0.000
Pseudo R2	0.555
C-Stat	0.942
Hosmer-Lemeshow, 20 groups, chi2(18)	12.250		0.834