Table 2.

Sociodemographic and lifestyle characteristics of women with breast cancer ¹, by race/ethnicity

	Non-Hispanic White N=4487		Hispanic N=2,264		African American N=1,972		Asian American N=1,644		Total N=10,366
	N	%	N	%	N	%	N	%	N	%
Age at diagnosis (years)
<35	105	2	96	4	41	2	82	5	324	3
35-49	783	17	744	33	541	27	615	37	2,683	26
50-64	2,019	45	933	41	861	44	683	42	4,496	43
65-79	1,283	29	467	21	467	24	249	15	2,466	24
≥80	297	7	23	1	62	3	15	1	397	4
Marital status 2
Never married	561	13	345	15	459	23	234	14	1,599	15
Married	2,822	63	1,372	61	776	39	1,212	74	6,182	60
Separated/divorced	514	11	281	12	415	21	82	5	1,292	12
Widowed	520	12	217	10	271	14	103	6	1,111	11
Unknown	70	2	48	2	51	3	13	1	182	2
Education
Some high school or less	78	2	812	36	244	12	108	7	1,242	12
High school graduate	336	7	493	22	431	22	180	11	1,440	14
Some college or technical school	622	14	566	25	774	39	392	24	2,354	23
College graduate or higher degree	3,445	77	383	17	514	26	962	59	5,304	51
Unknown	6	<1	9	<1	9	<1	2	<1	26	<1
Neighborhood SES (quintiles) 2
1 (low)	125	3	257	11	452	23	91	6	925	9
2	375	8	416	18	501	25	209	13	1,501	14
3	699	16	479	21	413	21	272	17	1,863	18
4	1,188	26	524	23	366	19	415	25	2,493	24
5 (high)	1,991	44	551	24	214	11	638	39	3,394	33
Unknown	109	2	36	2	26	1	19	1	190	2
Number of full-term pregnancies
Nulliparous	1,080	24	316	14	334	17	417	25	2,147	21
1	646	14	296	13	377	19	282	17	1,601	15
2	1,471	33	565	25	462	23	521	32	3,019	29
3	788	18	458	20	361	18	261	16	1,868	18
≥ 4	462	10	617	27	424	22	154	9	1,657	16
Unknown	37	1	11	<1	14	1	12	1	74	1
BMI (kg/m2) 3
<25	2,514	56	729	32	563	29	1,118	68	4,924	48
25-29.9	1,169	26	735	32	645	33	392	24	2,941	28
≥30	655	15	754	33	712	36	116	7	2,237	22
Unknown	149	3	45	2	52	3	18	1	264	3
Pre-diagnosis smoking history
Never	2,231	50	1,173	52	780	40	1,351	82	5,535	53
Past	1,426	32	375	17	452	23	203	12	2,456	24
Current	366	8	162	7	323	16	82	5	933	9
Unknown 4	464	10	553	24	417	21	8	<1	1,442	14
Pre-diagnosis alcohol consumption (drinks/week)
0	1,452	32	1,380	61	1,176	60	1,409	86	5,417	52
≤2	813	18	345	15	302	15	76	5	1,536	15
>2	2,080	46	511	23	447	23	155	9	3,193	31
Unknown	142	3	27	1	47	2	4	<1	220	2

Abbreviations: BMI, body mass index; ER, estrogen receptor status; PR, progesterone receptor; SES, socioeconomic status.

¹Analysis based on 8,163 women with ER/PR+ breast cancer and 2,203 women with ER−/PR− breast cancer.

²At diagnosis.

³In year before diagnosis (case-control studies) or within 6 months of diagnosis (cohort studies).

⁴Smoking history was not assessed in an early component of SFBCS and therefore unknown for 14% of cases.