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. Author manuscript; available in PMC: 2015 Jun 1.
Published in final edited form as: Occup Environ Med. 2014 Apr 12;71(6):442–447. doi: 10.1136/oemed-2013-102017

Table 1.

Population characteristics in primary analysis sample of men aged 40 years or more at baseline with complete covariate data.

Characteristic Overall
(n=30,448)		 Long-Haul Drivers
(n=10,642)		 Other job titles
(n=19,846)
Mean ± SD
Age at baseline 49.04 ± 6.01 49.89 ± 6.05 48.59 ± 5.94
Age when leaving active emp. 59.18 ± 4.73 60.04 ± 4.68 58.71 ± 4.68
Year of Hire 1972 ± 8.53 1973 ± 8.10 1972 ± 8.73
Average Pollutant Levels Near Home Residence
  PM10 (µg/m3) 26.83 ± 5.87 26.49 ± 5.62 27.01 ± 6.00
  NO2 (ppb) 14.18 ± 7.11 12.55 ± 5.89 15.03 ± 7.54
  SO2 (ppb) 4.85 ± 2.91 4.80 ± 2.85 4.88 ± 2.94
Census Region of Residence No. (%)
  South 11,505 (37.7) 4,220 (39.7) 7,285 (36.7)
  Midwest 9,736 (31.9) 3,745 (35.2) 5,991 (30.2)
  Northeast 4,477 (14.7) 1,046 (9.8) 3,471 (17.5)
  West 4,730 (15.5) 1,631 (15.3) 3,099 (15.6)
Race, White 25,872 (84.9) 9,385 (88.2) 16,487 (83.1)