Table 1.

Characteristics of autoworkers at baseline in 1985

Characteristics
No. of subjects	33421
Age, mean (SD)	46.98 (14.13)
Gender, n (%)
Male	28,908 (86.50)
Female	4,513 (13.50)
Race, n (%)
Whites	27,148 (81.23)
Black	6,271 (18.77)
Plant, n (%)
Plant 1	7,515 (22.45)
Plant 2	14,281 (42.73)
Plant 3	11,639 (34.82)
Calendar year of hire, mean (SD)	1964 (11.05)
Years since hire, mean (SD)	21.70 (11.04)
Any MWF exposure, n (%)
Non exposed	16,099 (48.17)
Exposed	17,322 (51.83)
Cumulative exposure, mean (SD)	7.74 (16.50)
Straight MWF*, n (%)
Non exposed	23,585 (70.57)
Exposed	9,636 (29.43)
Cumulative exposure, mean (SD)	1.63 (8.56)
Soluble MWF*, n (%)
Non exposed	16,644 (49.80)
Exposed	16,777 (50.20)
Cumulative exposure, mean (SD)	5.71 (12.60)
Synthetic MWF*, n (%)
Non exposed	288,773 (86.09)
Exposed	4,648 (13.91)
Cumulative exposure, mean (SD)	0.40 (2.96)

^*MWF exposure in units of mg/m³-yr with 15-yr lag