HRs and 95% CIs for breast cancer death in relation to PM2.5 exposure
| Cases (N) | Deaths (N) | HR (95% CI), breast cancer death | ||
|---|---|---|---|---|
| PM2.5 quartiles (μg/m3) | Univariate | Multivariate* | ||
| I (<21.10) | 504 | 40 | 1 | 1 |
| II (21.10–24.20) | 462 | 56 | 1.56 (1.04 to 2.34) | 1.82 (1.15 to 2.89) |
| III (24.20–26.50) | 530 | 71 | 1.55 (1.06 to 2.29) | 1.73 (1.12 to 2.67) |
| IV (≥26.50) | 525 | 79 | 1.49 (1.02 to 2.19) | 1.72 (1.08 to 2.75) |
*Multivariate stratified by age, stage, grade, diagnosis and participation in screening.
PM, particulate matter.