Table 4.
Association between BMI at diagnosis and breast cancer-specific and all-cause mortality via a Cox proportional hazards model, N = 5380.
| All-cause mortality (N = 571/5380) | Adjusteda HR (95% CI) | p-value | Breast cancer-specific mortality (N = 185/5380) | Adjusteda HR (95% CI) | p-value | |
|---|---|---|---|---|---|---|
| BMI at diagnosis, kg/m2 | ||||||
| ≤18.5 vs. 18.5–25 | 11/66 | 2.34 (1.27–4.34) | 0.01 | 3/66 | 1.77 (0.55–5.71) | 0.34 |
| 25–30 vs. 18.5–25 | 153/1652 | 0.86 (0.69–1.08) | 0.20 | 55/1652 | 1.00 (0.68–1.49) | 0.99 |
| 30–35 vs. 18.5–25 | 128/1119 | 0.95 (0.75–1.21) | 0.67 | 40/1119 | 0.89 (0.58–1.37) | 0.61 |
| ≥35 vs. 18.5–25 | 130/996 | 1.28 (1.00–1.62) | 0.05 | 41/996 | 1.13 (0.74–1.74) | 0.57 |
| Continuous, per 5 kg/m2 | 1.05 (0.98–1.11) | 0.15 | 0.97 (0.87–1.09) | 0.62 | ||
aAdjusted for Age at diagnosis (continuous), Race and ethnicity, Tumor subtype (ER/PR+, HER2−; ER/PR+, HER2+; ER/PR−, HER2+, TNBC), Clinical stage, Chemotherapy (yes/no), and Radiation (yes/no).