Table 1 Characteristics of included women diagnosed with incident invasive breast cancer in six New Mexico counties

Characteristic	Subcohort (N = 859) 15% random sample		Breast cancer deaths (N = 697) 100% sample
Characteristic	N	(%)	N	(%)
Age at diagnosis (years)
<40	43	5.0	56	8.1
40–49	146	17.0	143	20.5
50–59	217	25.2	180	25.8
60–69	206	24.0	117	16.8
70–79	158	18.4	123	17.6
80+	89	10.4	78	11.2
Year of diagnosis
1997–2000	253	29.4	257	36.9
2001–2004	256	29.8	238	34.1
2005–2009	350	40.8	202	30.0
Race/ethnicity
Non-Hispanic white	661	76.9	464	66.6
Hispanic/Latina	198	23.1	233	33.4
Menopausal status^a
Pre/peri	160	18.6	168	24.1
Postmenopausal	666	77.5	497	71.3
Missing	33	6.2	32	4.6
Body mass index (kg/m²)^a
18.5–24.9	338	39.3	252	36.2
25.0–29.9	246	28.6	172	24.7
>30.0	195	22.7	211	30.3
Missing	80	9.3	62	8.9
Stage^a
1	382	44.5	94	13.5
2	281	32.7	222	31.9
3/4	133	15.5	307	44.0
Missing	63	7.3	74	10.6
Tumor subtype^a
Luminal A	526	61.2	320	45.9
Luminal B	91	10.6	105	15.1
Her2+ ER−/PR−	24	2.8	32	4.6
Triple negative	61	7.1	85	12.2
Missing	157	18.3	155	22.2
Treatment (yes)^b
Chemotherapy	381	44.4	469	67.3
Radiation	560	65.2	400	57.4
Endocrine therapy	586	68.2	418	60.0

ER estrogen receptor, Her2 human epidermal growth factor receptor 2, PR progesterone receptor, Pre/peri premenopausal/perimenopausal
^aThe table reflects the frequencies prior to imputation, thus missing data are shown, which reflect the number of imputed values for each variable
^bNon-exclusive categories

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