Table 4.

The Association Between Socioeconomic status and Breast Cancer Mortality after a Breast Cancer Diagnosis Among 5,820 Breast Cancer Cases, Wisconsin, 1995–2003.

Characteristic	HR (95% CI)a	HR (95% CI)b	HR (95% CI)c	HR (95% CI)d
Individual-level variables
Education
College degree	1 (Ref)	1 (Ref)	1 (Ref)	1 (Ref)
Some college	1.28 (0.99, 1.67)	1.24 (0.95, 1.63)	1.20 (0.91, 1.57)	1.15 (0.88, 1.51)
No college	1.39 (1.10, 1.76)	1.35 (1.06, 1.71)	1.27 (0.99, 1.61)	1.20 (0.94, 1.55)
Income-to-poverty ratio
≥5.0	1 (Ref)	1 (Ref)	1 (Ref)	1 (Ref)
2.5–5.0	1.14 (0.83, 1.55)	0.97 (0.70, 1.34)	0.95 (0.68, 1.32)	0.90 (0.64, 1.25)
<2.5	1.46 (1.10, 1.92)	1.14 (0.84, 1.55)	1.09 (0.79, 1.49)	0.99 (0.71, 1.38)
Community-level variables
% without a high school diploma
0–9.9	1 (Ref)	1 (Ref)	1 (Ref)	1 (Ref)
10.0–19.9	1.37 (1.10, 1.70)	1.32 (1.06, 1.64)	1.29 (1.04, 1.87)	1.40 (1.09, 1.78)
≥20	1.61 (1.21, 2.15)	1.45 (1.09, 1.93)	1.40 (1.04, 1.87)	1.57 (1.09, 2.27)
% in poverty
0–4.9	1 (Ref)	1 (Ref)	1 (Ref)	1 (Ref)
5–9.9	0.97 (0.79, 1.19)	0.94 (0.76, 1.15)	0.91 (0.74, 1.12)	0.78 (0.62, 0.98)
≥10	1.25 (0.98, 1.61)	1.09 (0.85, 1.41)	1.06 (0.83, 1.37)	0.86 (0.63, 1.19)

Bolded estimates are statistically significant at P < 0.05.

HR, hazard ratio; CI, confidence interval.

^aAdjusted for age and year of diagnosis.

^bAdjusted for age, year of diagnosis, histologic type, stage at diagnosis, and mammography utilization.

^cAdjusted for age, year of diagnosis, histologic type, stage at diagnosis, mammography utilization, smoking history, family history of breast cancer, body mass index, and postmenopausal hormone use.

^dAdjusted for age, year of diagnosis, histologic type, stage at diagnosis, mammography utilization, smoking history, family history of breast cancer, body mass index, postmenopausal hormone use, and all socioeconomic variables.