Table 3.

Baseline Characteristics of both the Overall and BMD samples^*

Baseline Characteristic	Overall Sample (n=117707)		BMD Subset (n=8134)
	n	%	n	%
Age, years
50–54	16699	14.2	1287	15.8
55–59	24898	21.2	1687	20.7
60–64	28090	23.9	1831	22.5
65–69	25534	21.7	1774	21.8
70–74	16289	13.8	1149	14.1
75–79	6197	5.3	406	5.0
Race/Ethnicity
Black	8659	7.4	922	11.3
Hispanic	3531	3.0	447	5.5
White	101174	86.0	6617	81.4
Other / unknown	4343	3.7	148	1.8
Body mass index, kg/m2
< 25	41688	35.4	2678	32.9
25 - < 30	41046	34.9	2898	35.6
≥ 30	33967	28.9	2514	30.9
Smoking, current
Yes	7263	6.2	575	7.1
Alcohol Use, current (≥1 drink/month)
Yes	85534	72.7	5192	63.8
Hormone Therapy Use†
Yes	58316	49.5	3801	46.7
≥1 Fall in the Past Year
Yes	14177	31.5	2416	29.7
Parental History of Hip Fracture
Yes	15171	12.9	986	12.1
Early menopause (<45 years)
Yes	24127	20.5	1930	23.7
Low lumbar spine BMD T-score relative to femoral neck T-score‡
Yes	1094	0.9	1094	13.4
Major weight loss (>10% of weight at age 25)
Yes	1421	1.2	91	1.1
History of fracture ≥ age 55
Yes	10090	8.6	647	8.0
History of rheumatoid arthritis
Yes	5100	4.3	366	4.5
History of malabsorption
Yes	376	0.3	24	0.3
History of liver disease
Yes	2790	2.4	224	2.8
History of chronic obstructive pulmonary disease
Yes	3575	3.0	239	2.9
Glucocorticoid Use
Yes	792	0.7	57	0.7

^*BMD denotes bone mineral density

^†Self-reported at baseline or assignment to active hormone therapy group in the Women’s Health Initiative Hormone Therapy Trials

^‡Lumbar spine T-score at least 1SD lower than femoral neck T-score