Table 3.
Relative Risk Ratios (RRRs) and 95% Confidence Intervals (CIs) of Census Tract-Level Proportion of Black Residents with Breast Cancer Subtypes1
| Census tract-level proportion of Black residents | ||||||
|---|---|---|---|---|---|---|
| Q1 (lowest) | Q2 | Q3 | Q4 (highest) | p-trend | ||
| Luminal A | n (%) | 178 (25.1) | 178 (25.1) | 174 (24.5) | 180 (25.4) | |
| HER2-positive | n (%) | 71 (30.7) | 58 (25.1) | 59 (25.5) | 43 (18.6) | |
| RRR [95% CI] | 1 [reference] | 0.74 [0.48–1.15] | 0.79 [0.50–1.23] | 0.50 [0.30–0.83] | .024 | |
| Triple-negative | n (%) | 72 (25.8) | 83 (29.8) | 64 (22.9) | 60 (21.5) | |
| RRR [95% CI] | 1 [reference] | 0.91 [0.60–1.37] | 0.68 [0.43–1.05] | 0.54 [0.34–0.86] | .003 | |
1
Multilevel multinomial logistic regression models were used with luminal A as the reference group. Model adjusted for age at diagnosis, education, household poverty level, health insurance, menopausal status, parity/age at first birth/lactation, BMI 1 year prior to diagnosis, and census tract-level nSES score.