Table 1

Characteristics of the cohort and exposures by fire department and combined (1950–2009)

DescriptionAllSFFDCFDPFD
Study cohort19 309310110 3325876
Race (%) 
 Caucasian15 123 (78.3)2297 (74.1)7972 (77.2)4854 (82.6)
 Other4186 (21.7)804 (25.9)2360 (22.8)1022 (17.4)
Vital status 
 Alive (%)15 279 (79.1)2640 (85.1)7868 (76.1)4771 (81.19)
 Deceased (%)4030 (20.9)461 (14.9)2464 (23.9)1105 (18.8)
Employment
 Average hire year1978197919781977
 Age at hire; average (SD)28.3 (5)29.3 (5.6)29.0 (5.1)26.6 (4.8)
 Employment years; average (SD)20.7 (10.6)20.3 (9.9)21.4 (10.7)19.5 (10.8)
Apparatus: run-years 
 Available (%)13 517 (79.9)NA8430 (78.2)5087 (82.8)
 Estimated (%)3404 (20.1)NA2348 (21.8)1056 (17.2)
Exposure 
 Exposed-days percentile 
  Average (SD)5721 (3690)5929 (3722)5486 (3583)6024 (3827)
  10%728821441943
  25%2511264625392412
  50%5626621051576115
  75%8751942883728936
  100%16 67214 64914 86616 672
 Fire-runs percentile 
  Average (SD)5954 (4750)NA5627 (4706)6530 (4772)
  10%490NA294773
  25%2107NA19372538
  50%5164NA46935965
  75%8795NA81979661
  100%35 841NA35 84127 213
 Fire-hours percentile
  Average (SD)1548 (1144)NA1548 (1144)NA
  10%107NA107NA
  25%617NA617NA
  50%1381NA1382NA
  75%2322NA2322NA
  100%7417NA7417NA
  • CFD, Chicago Fire Department; NA, not available; PFD, Philadelphia Fire Department; SFFD, San Francisco Fire Department.