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Table 2 Number of workers, mean age at hiring and standard deviation (SD), person-years (PY) by age class for each group of workers

From: Reanalysis of updated mortality among vinyl and polyvinyl chloride workers: Confirmation of historical evidence and new findings

  Technicians and clerks1 Autoclave workers PVC Baggers PVC Compound workers Other blue collar workers Total blue collar workforce2 Total
Number of workers 202 210 198 404 644 1456 1658
Mean age at hire (SD) 27.4 (7.1) 26.1 (5.2) 31.7 (7.5) 29.5 (7.3) 29.5 (8.2) 29.3 (7.6) 29.1 (7.6)
PY age <30 266 325 79 333 897 1634 1900
PY age 30–44 2025 2298 1237 3388 5938 12861 14886
PY age 45–59 2283 2312 2483 4879 6966 16640 18923
PY age >59 729 511 1179 1710 2415 5815 6544
Total PY 5303 5446 4978 10310 16216 36950 42253
  1. 1 Reference group
  2. 2Total blue collar workforce = Autoclave workers + PVC Compound workers + PVC Baggers + Other blue collar workers.