Table 1.

Select Baseline Characteristics of Women and Men in the US Radiologic Technologists Study, 1983–2006

	Women (n = 69,506)		Men (n = 21,207)
	No.	%	No.	%
Age at study entry, years
<30	12,715	18.3	1,863	8.8
30–39	29,672	42.7	8,089	38.1
40–49	16,851	24.2	5,785	27.3
≥50	10,268	14.8	5,470	25.8
Year of birth
Before 1940	13,122	18.8	6,216	29.3
1940–1949	22,539	32.4	7,351	34.7
1950 or later	33,845	48.7	7,640	36.0
Race/ethnicity
White	66,711	96.0	19,197	90.5
Black	1,707	2.5	885	4.2
Asian/Pacific Islander	470	0.7	537	2.5
American Indian/Native Alaskan	125	0.2	116	0.6
Other/unknown	493	0.7	472	2.2
Menopausal status
Premenopausal	57,404	82.6
Postmenopausal	12,102	17.4
Smoking status
Never smoker	35,328	50.8	8,079	38.1
Former smoker	17,869	25.7	7,536	35.5
Current smoker	15,543	22.4	5,216	24.6
Unknown	766	1.1	376	1.8
Body mass index, kg/m2
<18.5	2,716	3.9	117	0.6
18.5–24.9	48,006	69.1	9,003	42.5
25.0–29.9	11,876	17.1	9,088	42.9
30.0–34.9	3,762	5.4	2,033	9.6
≥35.0	1,620	2.3	486	2.3
Unknown	1,526	2.2	480	2.3
Alcohol intake
Nondrinker	12,509	18.0	4,132	19.5
<1 drink/week	29,227	42.1	6,008	28.3
1–6 drinks/week	20,397	29.4	6,702	31.6
≥7 drinks/week	6,078	8.7	3,867	18.2
Unknown	1,295	1.9	498	2.4
History of any benign thyroid condition
Yes	6,332	9.1	430	2.0
Unknown	1,276	1.8	331	1.6