Tabulations of study participants, demographics and exposure to metalworking fluid in a study of autoworkers; subcohorts by race and gender
| Characteristic | Total cohort | White men | Black men | White women | Black women |
|---|---|---|---|---|---|
| Number of participants | 39 412 | 28 478 | 6137 | 3517 | 1280 |
| Number of person-years | 967 812 | 717 707 | 148 228 | 80 533 | 21 344 |
| Number of IHD cases | 2662 | 2246 | 295 | 119 | 2 |
| Demographics; median (25th, 75th) | |||||
| Year of birth | 1931 (1920, 1945) | 1931 (1920, 1944) | 1930 (1921, 1944) | 1924 (1917, 1945) | 1947 (1939, 1952) |
| Year of hire | 1955 (1950, 1968) | 1955 (1950, 1967) | 1959 (1948, 1968) | 1953 (1952, 1976) | 1973 (1972, 1976) |
| Case Age (years) | 64 (55, 72) | 64 (55, 72) | 63 (55, 71) | 69 (61, 76) | 55 (54, 55) |
| Duration of employment (years) | 20.1 (10.3, 28.6) | 19.8 (9.0, 28.9) | 24.7 (16.8, 30.1) | 17.3 (10.1, 22.1) | 18.7 (16.3, 21.6) |
| Soluble metalworking fluid | |||||
| Ever exposed; N(%) | 35 031(89%) | 25 444(89%) | 5562 (91%) | 2926 (83%) | 1099 (86%) |
| mg/m3-year ; median (25th, 75th) | 1.52 (0.56, 3.95) | 1.58 (0.62, 3.88) | 2.41 (0.69, 6.62) | 0.73 (0.23, 1.79) | 0.49 (0.15, 1.03) |
| Person-years exposed; N (%) | 359 914(37%) | 271 906(38%) | 59 694(41%) | 20 482(25%) | 7832 (36%) |
| Synthetic metalworking fluid | |||||
| Ever exposed; N(%) | 13 804(35%) | 10 805(38%) | 1206 (20%) | 1379 (39%) | 414 (32%) |
| mg/m3-year; median (25th, 75th) | 0.18 (0.05, 0.63) | 0.20 (0.05, 0.66) | 0.10 (0.03, 0.34) | 0.16 (0.04, 0.68) | 0.06 (0.02, 0.13) |
| Person-years exposed; N (%) | 101 092(10%) | 82 142(11%) | 8886 (6%) | 7601 (24%) | 2463 (11%) |
IHD, ischaemic heart disease.