Table 1

 Number of subjects by selected characteristics for each facility and for all employees combined

East Fishkill n (%)San Jose n (%)
*The total is less than the sum of the number of employees at each facility because 470 employees worked at both facilities.
†East Fishkill era 1,1965–73; era 2, 1974–83; era 3, 1984–99; San Jose era 1, 1965–72; era 2, 1973–89; era 3, 1990–9.
Total*42 612 (100)46 912 (100)
Sex/race or ethnicity
    Men, total27 946 (100)29 795 (100)
        White23 355 (84)15 450 (52)
        Hispanic696 (2)3519 (12)
        Asian1808 (6)8683 (29)
        African American2016 (7)2007 (7)
        American Indian35 (0)108 (0)
        Unknown36 (0)28 (0)
    Women, total14 666 (100)17 117 (100)
        White11 047 (75)7289 (43)
        Hispanic490 (3)3371 (20)
        Asian651 (4)4771 (28)
        African American2408 (16)1585 (0.9)
        American Indian27 (0)93 (1)
        Unknown43 (0)8 (0)
Vital status
    Alive38 927 (91)43 541 (93)
    Deceased2359 (6)1200 (3)
    Unknown1326 (3)2171 (5)
Age at end of follow-up (years)
    <4015 735 (25)19 212 (41)
    40–4910 716 (25)11 400 (24)
    50–597940 (19)9317 (20)
    ⩾608221 (19)6983 (15)
    Median4443
Sex and SES group
    Men
        Professionals13 386 (48)13 232 (44)
        Technicians4435 (16)2559 (9)
        Prod/cler/other10 125 (36)14 004 (47)
    Women
        Professionals2827 (19)4012 (23)
        Technicians1119 (8)450 (3)
        Prod/cler/other10 720 (73)12 655 (74)
Manufacturing era†
    110 212 (24)7490 (16)
    211 775 (28)19 103 (41)
    320 625 (48)20 319 (43)
Years worked at facility
    <113 834 (32)18 756 (40)
    1–411 276 (26)13 869 (30)
    ⩾517 502 (41)14 287 (30)
    Median3.11.6
Years since first record of employment at facility
    <1518 347 (43)26 605 (57)
    ≥1524 265 (57)20 307 (43)
    Median15.911.4
IBM employment status
    Active11 048 (26)8378 (18)
    Retired9893 (23)6989 (15)
    Left without retiring21 671 (51)31 545 (67)
Exposure category
    Exposed, ever31 686 (74)31 133 (66)
    Unexposed10 391 (24)15 221 (32)
Person-years499 445362 076