Table 2.

Hazard ratios (HR) and 95% confidence intervals (CI) for all-cause mortality, breast cancer-specific mortality, and non-breast cancer mortality according to body mass index

	All-cause mortality			Breast cancer-specific mortality			Non-breast cancer mortality
	HR	95% CI	p valuea	HR	95% CI	p valuea	HR	95% CI	p valuea
Body mass index (kg/m2)
< 18.5	1.31	0.80–2.15		0.33	0.12–0.93		1.78	1.09–2.95
18.5–24.9	1 (ref)			1 (ref)			1 (ref)
25–29.9	0.82	0.67–1.01		0.87	0.40–1.19		0.82	0.63–1.06
30–34.9	0.75	0.59–0.95		0.94	0.68–1.30		0.67	0.47–0.93
≥35	0.85	0.67–1.08		0.93	0.64–1.35		0.88	0.64–1.21
Per 5 kg/m2 Δ	0.93 (0.87–0.95)		0.02	0.98 (0.94–1.02)		0.42	0.90 (0.82–0.99)		0.04

Model adjusted for age, American Joint Commission on Cancer (AJCC) stage, insurance type, poverty in census tract of residence, education levels in census tract of residence, urbanicity of residence area, tumor grade, hormone receptor status, and comorbidity level. Survey sampling was stratified by tumor registry and by race/ethnicity

^ap value for trend, calculated from model using BMI as a continuous measure