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Table 1 Demographics of hourly production workers at 207 U.S. facilities of a global aluminum company employed between January 1, 1996 and December 31, 2007

From: Piecewise exponential models to assess the influence of job-specific experience on the hazard of acute injury for hourly factory workers

  Entire cohort Physical demand cohort
Cohort demographics Count Percent / Mean (SD)Median Count Percent / Mean (SD)Median
Total jobs 191 692   33 427  
Total unique employees 81 301   13 427  
Number of jobs per employee   2.36 (2.30) 2 3.99 (2.88) 3  
Number of injuries per employee   0.39 (0.96) 0 0.98 (1.49) 1  
Gender     
  Male 63 233 77.78 12 105 90.15
  Female 18 006 22.15 1 319 9.82
  Unknown/Missing 72 0.09 3 0.00
Race/Ethnicity     
  White 55 709 70.46 11 669 86.92
  Black 12 371 15.65 1242 9.25
  Hispanic 8340 10.55 386 2.88
  Asian 1786 2.26 46 0.34
  American Indian 610 0.77 66 0.49
  Mixed (more than one reported) 247 0.31 16 0.12
  Unknown/Missing 2238 2.75 2 0.01
Age (years) at start of job   39.37 (11.32) 39.23   42.61 (10.19) 43.24
Tenure (years) at start of job   8.43 (10.25) 3.62   13.27 (11.96) 9.60