Table 1.

Biomarker Study Subject Characteristics at the Time of Participation (Visit 1) in the Nutrient Biomarker Study (NBS) and the Nutrition and Physical Activity Assessment Study (NPAAS) within Women’s Health Initiative Cohorts

Biomarker Study		NBS*		NPAAS*
Characteristic	Category	N	%	N	%
Age (years)	[50,64]	88	16.2	47	10.4
	(64,75]	298	54.8	308	68.4
	(75,91]	158	29	95	21.1
BMI (kg/m2)	<25	177	32.5	156	34.7
	[25,30)	189	34.7	121	26.9
	≥30	178	32.7	173	38.4
Race/ethnicity	White	448	82.4	288	64.0
	Black	59	10.8	84	18.7
	Hispanic	26	4.8	64	14.2
	Other	11	2	14	3.1
Family Income ($1000)	≥75	94	18.2	117	27.0
	50–74	123	23.8	84	19.4
	35–49	107	20.7	98	22.6
	20–34	60	11.6	43	9.9
	<20	133	25.7	92	21.2
Education	High school/GED or less	102	18.8	64	14.3
	School after High school	207	38.2	157	35.1
	College degree or Higher	233	43.0	227	50.7
Cigarette smoker	No	524	96.5	429	97.5
	Yes	19	3.5	11	2.5
Dietary Suppl. Use	No	84	15.4	219	48.8
	Yes	460	84.6	230	51.2

^*Abbreviations: NBS, Nutrient Biomarker Study; NPAAS, Nutrition and Physical Activity Assessment Study