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Table 3 Regression models of an association between an occupation and selected spirometric outcomes

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

Exposures (occupations) FEV1 < 80 % FEV1/FVC < 70 % FEV1/FVC < 70 % and FEV1 < 80 %
Drillers 1.46 (0.69–3.11) 1.53 (1.11–2.09) 1.53 (0.60–3.92)
Drivers 1.24 (0.80–1.91) 1.18 (0.88–1.58) 1.03 (0.58–1.84)
Mechanics 0.63 (0.33–1.19) 0.95 (0.65–1.37) 0.80 (0.37–1.71)
Cleaners 0.14 (0.02–1.05) 0.51 (0.24–1.09) 0.26 (0.03–1.93)
Office staff and engineers 1.30 (0.61–2.75) 0.90 (0.51–1.59) 1.68 (0.71–4.02)
Food handlers 1.18 (0.41–3.40) 1.11 (0.53–2.33) 0.99 (0.23–4.25)
Mill operators including grinders 0.73 (0.22–2.36) 2.01 (1.13–3.57) 1.29 (0.39–4.24)
Security staff 0.60 (0.22–1.68) 0.84 (0.47–1.51) 0.28 (0.03–1.80)
  1. data are presented as adjusted for smoking and work duration odds ratios (OR) with relevant 95 % confidence intervals (CI); group ‘Drivers’ includes all relevant operators. Reference groups in each model are all other occupations combined