Table 4 Association between neighborhood-level factors and risk of ER− breast cancer stratified by years of education
Exposure |  ≤ 12 years of education |  > 12 years of education | ||||||
|---|---|---|---|---|---|---|---|---|
Cases | Person-years | Age-adjusted HR (95% CI)a | MV-adjusted HR (95% CI)b | Cases | Person-years | Age-adjusted HR (95% CI)a | MV-adjusted HR (95% CI)b | |
Neighborhood SESc | ||||||||
 Quartile 1 (low) | 51 | 75,846 | 1.32 (0.86–2.03) | 1.48 (0.95–2.31) | 112 | 182,610 | 1.09 (0.88–1.37) | 1.12 (0.89–1.40) |
 Quartile 2 | 36 | 52,647 | 1.31 (0.82–2.09) | 1.39 (0.87–2.22) | 123 | 205,192 | 1.08 (0.87–1.33) | 1.09 (0.88–1.36) |
 Quartiles 3 and 4 (higher) | 35 | 65,509 | 1.00 (ref) | 1.00 (ref) | 267 | 476,572 | 1.00 (ref) | 1.00 (ref) |
Neighborhood concentrated disadvantaged | ||||||||
 Quartiles 1 and 2 (lower) | 36 | 72,687 | 1.00 (ref) | 1.00 (ref) | 267 | 469,971 | 1.00 (ref) | 1.00 (ref) |
 Quartile 3 | 30 | 53,516 | 1.15 (0.71–1.86) | 1.23 (0.75–2.00) | 135 | 217,510 | 1.08 (0.88–1.33) | 1.09 (0.88–1.34) |
 Quartile 4 (high) | 59 | 72,780 | 1.67 (1.10–2.53) | 1.94 (1.26–2.99) | 111 | 189,808 | 1.01 (0.81–1.26) | 1.02 (0.81–1.28) |