Table 2

 Baseline demographic characteristics and medical histories of automotive stamping plant and engine plant workers; total baseline cohort and subjects with reliable data in follow up survey, Detroit, MI, USA, 1993–94

BaselineFollow up
Total (n = 1283)Total (n = 790)Non-case at baseline (n = 458)Case at baseline (n = 332)
*History of diabetes mellitus, lupus, gout, thyroid, and/or kidney disease.
†Regular participation in sports, hobby, second job, or other activity every week.
‡Data not obtained at baseline.
Stamping plant: no. (%)670 (52%)414 (53%)221 (48%)193 (58%)
Male: no. (%)1047 (82%)643 (81%)397 (87%)246 (74%)
Previous UE injury: no. (%)509 (40%)319 (40%)170 (37%)149 (45%)
Systemic disease*: no. (%)266 (21%)164 (21%)79 (17%)85 (26%)
Regular weekly outside activity†: no. (%)846 (66%)533 (67%)295 (64%)238 (72%)
Cigarette smoking:
    no. (%) current577 (45%)353 (45%)194 (42%)159 (48%)
    no. (%) former298 (23%)195 (25%)109 (24%)86 (26%)
Alcohol use:
    no. (%) current753 (59%)477 (61%)259 (57%)218 (66%)
    no. (%) former189 (15%)102 (13%)67 (15%)35 (11%)
Race‡:
    no. (%) African-American463 (59%)273 (60%)190 (58%)
    no. (%) white/non-Hispanic290 (37%)158 (35%)132 (40%)
Age (years): mean (SD)46.5 (8.2)46.3 (8.2)46.2 (8.6)46.6 (7.6)
Quetelet body mass index: mean (SD)27.5 (4.9)27.3 (4.5)27.1 (4.5)27.6 (4.6)
Seniority in company (years): mean (SD)21.5 (6.5)21.5 (6.8)21.4 (7.4)21.6 (5.8)
Seniority in plant (years): mean (SD)16.9 (8.1)16.8 (8.2)16.6 (8.5)17.0 (7.6)
Seniority in job (years): mean (SD)13.1 (7.8)13.1 (7.8)12.8 (7.9)13.5 (7.5)
Ergonomic exposure score: mean (SD)13.1 (4.8)13.1 (4.7)12.3 (4.9)14.1 (4.2)
Psychosocial job demands‡: mean (SD)28.9 (3.2)28.8 (3.1)29.1 (3.4)
Psychosocial job control‡: mean (SD)61.1 (9.3)61.7 (9.3)60.3 (9.2)