Table 1.

Baseline demographic and medical history characteristics by physical activity group among participants in the Women's Health Initiative Observational Study recruited between 1993 and 1998 from 40 clinical centers across the United States (n=93,676)

		0METs (N=12,636)		>0-3METs (N=9,954)		3.1-8.9METs (N=21,192)		≥9METs (N=48,843)		p-value
		N	%	N	%	N	%	N	%
Age group at screening	50-59	4215	33.36	3142	31.57	6610	31.19	15411	31.55	<0.001
	60-69	5341	42.27	4323	43.43	9147	43.16	21925	44.89	.
	70-79	3080	24.37	2489	25.01	5435	25.65	11507	23.56	.
Race/ ethnicity	White	9707	76.82	7823	78.59	17456	82.37	42223	86.45	<0.001
	Black	1612	12.76	1132	11.37	1874	8.84	2943	6.03	.
	Hispanic	692	5.48	492	4.94	868	4.10	1423	2.91	.
	American Indian	80	0.63	63	0.63	94	0.44	179	0.37	.
	Asian/Pacific Islander	351	2.78	300	3.01	580	2.74	1422	2.91	.
	Unknown	194	1.54	144	1.45	320	1.51	653	1.34	.
Education	0-8 years	386	3.08	234	2.37	380	1.81	476	0.98	<0.001
	Some high school	766	6.11	519	5.26	836	3.98	1116	2.30	.
	High school diploma/GED	2841	22.67	1993	20.18	3745	17.82	6370	13.15	.
	School after high school	4817	38.44	3875	39.24	7875	37.46	16999	35.09	.
	College degree or higher	3722	29.70	3255	32.96	8184	38.93	23484	48.48	.
Years	< 10 yrs	3539	29.46	2712	28.72	6086	29.90	14849	31.39	<0.001
menopausal	>=10 yrs	8472	70.54	6730	71.28	14266	70.10	32453	68.61	.
Smoking status	Never	6332	50.68	5198	52.96	11077	52.84	24026	49.76	<0.001
	Past	4878	39.04	3769	38.40	8422	40.17	22134	45.84	.
	Current	1284	10.28	848	8.64	1466	6.99	2128	4.41	.
Alcohol intake	Non Drinker	7028	55.71	5111	51.42	9327	44.06	17292	35.45	<0.001
	<= 1 drink/day	4437	35.17	3913	39.37	9522	44.98	24292	49.80	.
	> 1 drink/day	1150	9.12	915	9.21	2319	10.96	7200	14.76	.
Treated diabetes (pills or shots)	No	11797	93.50	9285	93.43	20191	95.40	47383	97.12	<0.001
	Yes	820	6.50	653	6.57	973	4.60	1403	2.88	.
History of hypertension	Never hypertensive	7454	59.71	5937	60.31	13410	63.95	34250	70.68	<0.001
	Untreated hypertensive	1123	9.00	826	8.39	1742	8.31	3613	7.46	.
	Treated hypertensive	3906	31.29	3081	31.30	5816	27.74	10595	21.86	.
Hormone Therapy use	Never used	5635	44.63	4502	45.26	8875	41.91	18527	37.97	<0.001
	Past user	1924	15.24	1497	15.05	3190	15.06	7147	14.65	.
	Current user	5067	40.13	3948	39.69	9110	43.02	23122	47.39	.
Beta blockers use	No	11399	90.21	9025	90.67	19174	90.48	45422	93.00	<0.001
	Yes	1237	9.79	929	9.33	2017	9.52	3421	7.00	.
Antianxiety agents use	No	12035	95.24	9531	95.75	20387	96.21	47423	97.09	<0.001
	Yes	601	4.76	423	4.25	804	3.79	1420	2.91	.
Hypnotics use	No	12197	96.53	9652	96.97	20578	97.11	47612	97.48	<0.001
	Yes	439	3.47	302	3.03	613	2.89	1231	2.52	.
Narcotics use	No	12167	96.29	9651	96.96	20732	97.83	48115	98.51	<0.001
	Yes	469	3.71	303	3.04	459	2.17	728	1.49	.
Sedative use	No	12501	98.93	9854	99.00	21015	99.17	48458	99.21	0.007
	Yes	135	1.07	100	1.00	176	0.83	385	0.79	.
Fainted, last 12 months	No	12157	97.05	9599	97.28	20507	97.44	47406	97.64	0.001
	Yes	369	2.95	268	2.72	539	2.56	1144	2.36	.
Prior falls, last 12 months	None	8390	66.87	6585	66.50	14184	67.35	33297	68.51	<0.001
	1 time	2498	19.91	1988	20.08	4253	20.19	9524	19.60	.
	2 times	1023	8.15	858	8.66	1787	8.48	3851	7.92	.
	3 or more times	635	5.06	471	4.76	837	3.97	1930	3.97	.
Physical function > 90	No	9585	77.64	7463	76.60	14252	68.40	25128	52.28	<0.001
	Yes	2760	22.36	2280	23.40	6584	31.60	22935	47.72	.
Body Mass Index (kg/m2), baseline	<25	3376	27.12	2881	29.24	7744	36.95	23408	48.48	<0.001
	25 - <30	3988	32.03	3268	33.17	7461	35.60	16408	33.99	.
	>=30	5085	40.85	3704	37.59	5755	27.46	8464	17.53	.
Body composition		Mean	SD	Mean	SD	Mean	SD	Mean	SD	p-value
Whole body lean mass (%)		54.60	7.42	54.06	6.88	56.25	7.29	58.70	7.34	<0.001
Appendicular lean mass (kg)		15.05	2.98	14.83	3.12	14.47	2.85	14.26	2.46	<0.001
Activity
Total Physical activity, (MET-hrs/wk)		0.00	0.00	1.62	0.69	5.72	1.74	23.15	13.94	<0.001
Time spent sitting (hrs/d)		7.94	3.72	7.57	3.43	7.40	3.36	6.87	3.19	<0.001
Time spent sleeping (hrs/d)		7.76	2.60	7.79	2.47	7.83	2.33	7.92	2.18	<0.001