Table 1.

Select Characteristics of Postmenopausal Women From the NIH-AARP and PLCO Cohort Studies, United States, 1993–2010

Characteristic or Risk Factor	NIH-AARP Study				PLCO Study				Pooled Study
	Cases		Noncases		Cases		Noncases		Cases		Noncases
	No.	%a	No.	%a	No.	%a	No.	%a	No.	%a	No.	%a
No. of participants	601		209,699		191		73,461		792		283,160
Person-years of follow-up	3466.6		2,047,170.5		1,046.6		719,787.1		4,513.2		2,766,927.6
Age at enrollment, years
<59	158	26.3	72,185	34.4	47	24.6	24,881	33.9	205	25.9	97,066	34.3
60–64	198	32.9	60,997	29.1	73	38.2	22,292	30.3	271	34.2	83,289	29.4
65–69	216	35.9	68,820	32.8	45	23.6	16,267	22.1	261	33.0	85,087	30.0
≥70	29	4.8	7,697	3.7	26	13.6	10,021	13.6	55	6.9	17,718	6.3
Missing	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0
Body mass indexb
<25	174	29.0	89,380	42.6	49	25.7	29,330	39.9	223	28.2	118,710	41.9
25–30	182	30.3	66,119	31.5	65	34.0	25,176	34.3	247	31.2	91,295	32.2
>30	224	37.3	47,538	22.7	75	39.3	17,994	24.5	299	37.8	65,532	23.1
Missing	21	3.5	6,662	3.2	2	1.0	961	1.3	23	2.9	7,623	2.7
Smoking status
Never smoked	250	41.6	91,384	43.6	104	54.5	40,852	55.6	354	44.7	132,236	46.7
Former smoker	254	42.3	81,739	39.0	61	31.9	25,459	34.7	315	39.8	107,198	37.9
Current smoker	80	13.3	30,357	14.5	26	13.6	7,134	9.7	106	13.4	37,491	13.2
Missing	17	2.8	6,219	3.0	0	0.0	16	0.0	17	2.1	6,235	2.2
Highest educational level completed
≤11 years	57	9.5	13,420	6.4	17	8.9	4,519	6.2	74	9.3	17,939	6.3
12 years or completed high school	171	28.5	53,815	25.7	62	32.5	20,263	27.6	233	29.4	74,078	26.2
Post–high school training other than college	60	10.0	22,480	10.7	25	13.1	9,519	13.0	85	10.7	31,999	11.3
Some college	142	23.6	51,871	24.7	46	24.1	17,094	23.3	188	23.7	68,965	24.4
College graduate or postgraduate	139	23.1	61,289	29.2	41	21.5	21,920	29.8	180	22.7	83,209	29.4
Missing	32	5.3	6,824	3.3	0	0.0	146	0.2	32	4.0	6,970	2.5
Race
Non-Hispanic white	528	87.9	187,916	89.6	174	91.1	65,372	89.0	702	88.6	253,288	89.5
Non-Hispanic black	42	7.0	11,712	5.6	10	5.2	4,017	5.5	52	6.6	15,729	5.6
Hispanic	17	2.8	3,856	1.8	3	1.6	1,144	1.6	20	2.5	5,000	1.8
Asian, Pacific Islander, Native Indian, or Alaskan Native	5	0.8	3,218	1.5	4	2.1	2,902	4.0	9	1.1	6,120	2.2
Missing	9	1.5	2,997	1.4	0	0.0	26	0.0	9	1.1	3,023	1.1
History of diabetes
No	526	87.5	193,451	92.3	165	86.4	64,699	88.1	691	87.2	258,150	91.2
Yes	75	12.5	16,248	7.7	16	8.4	4,793	6.5	91	11.5	21,041	7.4
Missing	0	0.0	0	0.0	10	5.2	3,969	5.4	10	1.3	3,969	1.4
Hypertension statusc
No	141	40.9	69,834	55.4	95	49.7	46,735	63.6
Yes	189	54.8	47,552	37.7	90	47.1	24,848	33.8
Missing	15	4.3	8,580	6.8	6	3.1	1,878	2.6
Estimated time since hysterectomy, years
No hysterectomy	291	48.4	114,722	54.7	103	53.9	46,279	63.0	394	49.8	161,001	56.9
<10	27	4.5	9,685	4.6	11	5.8	3,569	4.9	38	4.8	13,254	4.7
10 to <20	93	15.5	28,103	13.4	26	13.6	8,358	11.4	119	15.0	36,461	12.9
20 to <30	116	19.3	36,672	17.5	40	20.9	12,125	16.5	156	19.7	48,797	17.2
≥30	41	6.8	9,943	4.7	11	5.8	2,917	4.0	52	6.6	12,860	4.5
Missing	33	5.5	10,574	5.0	0	0.0	213	0.3	33	4.2	10,787	3.8

Abbreviations: NIH-AARP, National Institutes of Health–AARP Diet and Health Study; PLCO, Prostate, Lung, Colorectal and Ovarian Cancer Screening Trial.

^a Because of rounding error, some categories might not sum to 100%.

^b Weight (kg)/height (m)².

^c Data for hypertension status in NIH-AARP based on risk factor questionnaire responses.