. Author manuscript; available in PMC: 2016 Dec 1.

Published in final edited form as: Mol Carcinog. 2014 Oct 22;54(12):1541–1553. doi: 10.1002/mc.22228

Table 2.

Characteristics of study population, stratified by ethnicity and case-control status, The Breast Cancer Health Disparities Study (n=7,732)

	Non-Hispanic Whites (n=3,029)					Hispanics (n= 4,703)
	Cases		Controls			Cases		Controls

	No.	%	No.	%	p value¹	No.	%	No.	%	p value¹	p value²
*Total Subjects*	*1,430*		*1,599*			*2,093*		*2,610*
Study Site
4-CBCS	1,176	82.2	1,335	83.5	0.36	579	27.7	736	28.2	0.94	<0.001
Mexico	-		-			816	39.0	994	38.1
SFBCS	254	17.8	264	16.5		698	33.4	880	33.7
Age (years)
<40	87	6.1	117	7.3	0.04	198	9.5	313	12.0	0.22	<0.001
40–49	400	28.0	409	25.6		708	33.8	834	32.0
50–59	403	28.2	410	25.6		614	29.3	758	29.0
60–69	340	23.8	356	22.3		425	20.3	530	20.3
≥70	200	14.0	307	19.2		148	7.1	175	6.7
Percentage of Native American ancestry
< 0.29	1,419	99.2	1,591	99.5	0.34	276	13.2	280	10.7	0.01	<0.001
≥ 0.29	11	0.8	8	0.5		1,817	86.8	2,330	89.3
Menopausal status
Premenopausal	474	34.0	494	31.5	0.14	831	41.2	1,027	40.7	0.71	<0.001
Postmenopausal	919	66.0	1,075	68.5		1,186	58.8	1,499	59.3
Body mass index (kg/m²)
Normal (< 25)	650	46.1	699	44.4	0.35	482	23.4	453	17.6	<0.001	<0.001
Overweight or obese (≥25)	761	53.9	877	55.7		1,580	76.6	2,123	82.4
Fat intake/1000 kcal per day	Median		Median		p value³	Median		Median		p value³	p value⁴
Total fat (g)	38.45		38.83		0.19	36.63		36.74		0.44	<0.001
Polyunsaturated fat (g)	7.85		7.88		0.59	7.29		7.69		0.001	0.12
History of aspirin use⁵
Yes	262	22.6	324	24.5	0.26	84	14.8	140	19.4	0.03	<0.001
No	898	77.4	997	75.5		483	85.2	583	80.6
History of NSAIDs use⁵
Yes	363	31.3	409	31.0	0.86	137	24.2	201	27.8	0.14	0.002
No	797	68.7	912	69.0		430	78.8	522	72.2

Missing information: menopausal status n=227; body mass index n=107; total fat n=202; polyunsaturated fat n=202

Case-control comparison within ethnicity. p values from chi-square tests.

Ethnic group comparison, regardless of case-control status. p values from chi-square tests.

Case-control comparison within ethnicity. p values from t-tests.

⁴

Ethnic group comparison, regardless of case-control status. p values from t- tests.

⁵

Data on regular use of aspirin and NSAIDs were collected in the 4-CBCS only.