Table 1.

Cohort demographics and exposures by sex, race, and pay code^*

	Male				Female
	Caucasian†		Non-Caucasian		Caucasian‡		Non-Caucasian
Metric	Hourly	Salaried	Hourly	Salaried	Hourly	Salaried	Hourly	Salaried
Number	3440	1771	193	47	153	731	30	38
Person-years at risk	125338	67615	6337	1487	4641	28839	912	1150
Years of follow-up (mean, SD)	36.4 (13.1)	38.2 (12.4)	32.8 (12.2)	31.6 (9.7)	30.3 (11.9)	39.4 (12.3)	30.4 (6.6)	30.3 (7.1)
Percent deceased	52.8	37.9	38.3	12.8	28.8	19.6	13.3	15.8
Mean year of birth	1928	1931	1935	1946	1938	1936	1951	1947
Mean year of hire	1959	1960	1965	1971	1970	1963	1973	1973
Age at hire (mean, SD)	31.6 (8.6)	29.4 (8.9)	29.7 (9.4)	25.2 (5.9)	32.1 (9.9)	26.3 (7.8)	22.0 (7.1)	25.9 (9.5)
Years of employment (mean, SD)	10.2 (9.9)	8.53 (9.9)	10.2 (9.4)	4.69 (6.4)	8.48 (8.6)	7.19 (8.8)	2.64 (5.4)	3.42 (5.1)
Number of bioassay samples per worker (mean, SD)	52.1 (57.1)	18.3 (25.3)	50.0 (50.4)	12.7 (21.4)	39.4 (51.9)	10.5 (16.8)	9.5 (20.3)	5.4 (10.7)
Mean cumulative organ dose (µGy)
Lung	1552	388	965	138	67.9	296	34.5	154
Kidney	133	33.9	80.6	12.1	5.97	26.3	3.02	13.5
Red bone marrow	45.4	11.9	27.1	4.15	2.13	9.63	1.00	4.64
Lower large intestine	16.3	4.45	9.84	1.48	0.81	3.80	0.33	1.64
Pancreas	9.36	2.73	5.54	0.861	0.51	2.49	0.18	0.96
Mean cumulative external dose (mGy)	20.7	3.05	13.6	2.16	5.51	0.53	0.77	0.21
Mean cumulative RDP (working level months)	39.1	12.0	19.4	6.46	2.91	4.59	3.54	0.81

^*Workers employed at the Fernald Feed Materials Production Center at least 30 days between 1951–1985.

^†Results exclude four Caucasian males with unknown pay code (two of these were known to be deceased).

^‡Results exclude two Caucasian females with unknown pay code (both were deceased).

FMPC, Feed Materials Production Center; PYAR, Person-years at risk; RDP, radon decay products.