Table 4.

Hazard ratios (HR) and 95% confidence intervals (CI) for all-cause mortality according to body mass index, stratified by AJCC stage at diagnosis

	N	All-cause mortalitya
		HR	95% CI	p value for trend
Stage I (N = 2504)
Body mass index (kg/m2)
< 18.5	40	1.95	1.03–3.69
18.5–24.9	807	1 (ref)
25–29.9	780	0.85	0.60–1.21
30–34.9	495	0.71	0.48–1.06
≥ 35	382	1.16	0.74–1.83
Per 5 kg/m2 Δ		0.94	0.82–1.08	0.40
Stage II (N = 2060)
Body mass index (kg/m2)
< 18.5	27	0.90	0.35–2.29
18.5–24.9	594	1 (ref)
25–29.9	584	0.77	0.55–1.08
30–34.9	448	0.66	0.45–0.96
≥ 35	407	0.84	0.58–1.23
Per 5 kg/m2 Δ		0.93		0.17
Stage III (N = 815)
Body mass index (kg/m2)
< 18.5	10	0.63	0.24–1.70
18.5–24.9	216	1 (ref)
25–29.9	231	0.73	0.49–1.08
30–34.9	183	0.86	0.56–1.30
≥35	175	0.70	0.44–1.11
Per 5 kg/m2 Δ		0.92	0.83–1.02	0.11

A significant interaction between BMI and AJCC stage was not found (p = 0.83); stratified analysis was conducted descriptively

^aAll models adjusted for age, 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