Table 1. Select baseline characteristics by the use of menopausal hormone therapy and hormone type among 92 601 women in NIH-AARP Diet and Health Study, 1995–2006.

	Menopausal hormone use				Menopausal hormone type
	Never use		Ever use		Oestrogen only		Oestrogen plus progestin-only
	(N=42 204)		(N=50 397)		(N=17 922)		(N=19 726)
	N a	%	N a	%	N a	%	N a	%
Age at study entry (years)
<55	3789	9.0	6474	12.9	2069	11.6	3154	16.0
55–59	7832	18.6	13 483	26.8	4036	22.5	6423	32.6
60–64	12 374	29.3	15 038	29.8	5186	28.9	5870	29.8
65–69	16 330	38.7	13 874	27.5	5898	32.9	3921	19.9
70+	1879	4.4	1528	3.0	733	4.1	358	1.8
Race/ethnicity
White	37 790	89.5	46 711	92.7	16 373	91.4	18 594	94.3
Other	4414	10.5	3686	7.3	1549	8.6	1132	5.7
Smoking status
Never	19 163	45.4	22 096	43.8	8012	44.7	8524	43.2
Former	15 353	36.4	21 045	41.8	7084	39.5	8578	43.5
Current	6575	15.6	5989	11.9	2388	13.3	2166	11.0
Age at menarche
<13	20 323	48.1	24 243	48.1	8888	49.6	9260	46.9
13–14	17 780	42.1	21 496	42.7	7418	41.4	8712	44.2
15+	3951	9.4	4543	9.0	1579	8.8	1720	8.7
Age at natural menopause (years)
<45	4477	10.6	3321	6.6	862	4.8	1438	7.3
45–49	9992	23.7	8501	16.9	1645	9.2	4548	23.1
50–54	17 538	41.6	15 835	31.4	2388	13.3	9393	47.6
55+	3524	8.4	4026	8.0	466	2.6	2426	12.3
Surgical	6138	14.5	16 416	32.5	12 370	69.0	524	2.7
Unknown	535	1.3	2298	4.6	191	1.1	1397	7.1
Oral contraceptive use
Never/<1 year	29 254	69.3	26 638	52.9	10 301	57.5	9435	47.8
1–9 years	9865	23.4	17 186	34.1	5781	32.3	7271	36.9
10+years	2816	6.7	6252	12.4	1734	9.7	2900	14.7
Parity
Nulliparous	7117	16.9	6980	13.9	1821	10.2	3342	16.9
1	4186	9.9	4888	9.7	1575	8.8	2120	10.8
2	9871	23.4	13 704	27.2	4575	25.5	5664	28.7
3+	20 876	49.5	24 663	48.9	9881	55.1	8549	43.3
Body mass index in kg m −2
<25	16 733	39.7	25 071	49.8	8035	44.8	10 623	53.9
25–29.9	13 395	31.7	15 462	30.7	5825	32.5	5754	29.2
30+	10 705	25.4	8711	17.3	3630	20.3	2949	15.0
Hysterectomy at baseline
No	35 669	84.5	32 927	65.3	4902	27.4	19 140	97.0
Yes	6303	14.9	17 281	34.3	12 959	72.3	520	2.6

Abbreviation: NIH-AARP=National Institutes of Health-AARP.

^aNumbers may not add to total because of missing values.