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Table 1 Study participants’ profile

From: Drillers and mill operators in an open-pit gold mine are at risk for impaired lung function

Variable  
N 1550
Age, years 40.5 ± 9.2
Male/female, N 1357/193
BMI, kg/m2 25.8 ± 3.7
Working at high-altitude site, N (%) 1477 (95.3 %)
Smoking
Current smokers, N (%) 627 (40.5 %)
Cigarettes a day 9.2 ± 4.8
Duration of smoking, years 13.7 ± 7.8
Ex-smokers, N (%) 460 (29.7 %)
Never smokers, N (%) 463 (29.8 %)
Spirometry
VC, % pred. 103.0 ± 12.9
FVC, % pred. 109.1 ± 13.0
FEV1, % pred. 100.2 ± 25.9
FEV1/FVC, % 76.5 ± 20.3
PEF, % pred. 107.5 ± 16.7
MEF50, % pred. 77.7 ± 24.1
Occupations
Mechanics, N (%) 242 (15.6)
Mine truck drivers, N (%) 221 (14.3)
Bulldozer, Grader and Loader/shovel operators, N (%) 128 (8.3)
Cleaners, N (%) 99 (6.4)
Security staff, N (%) 96 (6.2)
Drillers, N (%) 88 (5.7)
Office staff, N (%) 82 (5.3)
Other drivers, N (%) 72 (4.6)
Engineers, N (%) 61 (3.9)
Food handlers (kitchen), N (%) 58 (3.7)
Mill operators, N (%) 48 (3.1)
Warehouse staff, N (%) 45 (2.9)
Blasters, N (%) 41 (2.6)
Lab technicians, N (%) 36 (2.3)
Welders, N (%) 34 (2.2)
Samplers, N (%) 23 (1.5)
Geologists, N (%) 18 (1.2)
Grinder operators, N (%) 14 (0.9)
Surveyors, N (%) 11 (0.7)
Other, N (%) 133 (8.6)
  1. ‘Other drivers’ include powertrucks, passenger trucks and conveyance vehicles; ‘Office staff’ include trainers, accountants, management, administrators and interpreters. Data presented as mean ± standard deviation