Subjects n | ΔFEV1 mL·yr−1 | ΔFEV1 %·yr−1 # | ΔFVC mL·yr−1 | ΔFVC %·yr−1 ¶ | |
Male workers | |||||
Nonsmokers | |||||
Woodworkers | 494 | -24.0±42.9 | -0.59±1.07 | -21.9±48.5 | -0.43±0.96 |
Reference workers | 49 | -25.0±49.2 | -0.58±1.24 | -27.8±49.7 | -0.55±1.03 |
Smokers+ | |||||
Woodworkers | 429 | -34.6±45.0* | -0.92±1.34* | -28.5±52.3* | -0.58±1.13* |
Reference workers | 51 | -43.5±53.6 | -1.13±1.46 | -34.7±61.9 | -0.73±1.32 |
Female workers | |||||
Nonsmokers | |||||
Woodworkers | 87 | -19.2±37.8 | -0.57±1.25 | -15.2±37.1 | -0.39±0.96 |
Reference workers | 58 | -15.5±34.1 | -0.46±1.03 | -10.7±33.9 | -0.27±0.88 |
Smokers+ | |||||
Woodworkers | 96 | -37.0±45.3 *,§ | -1.28±1.65*,§ | -32.1±51.6* | -0.85±1.31* |
Reference workers | 71 | -23.5±36.9 | -0.78±1.23 | -21.7±42.0 | -0.55±1.05 |
Data are presented as mean±sd, unless otherwise stated. Δ: change; FEV1: forced expiratory volume in one second; FVC: forced vital capacity. #: calculated as (ΔFEV1/FEV1 at baseline)×100; ¶: calculated as (ΔFVC/FVC at baseline)×100; +: smokers are current smokers and ex-smokers who stopped smoking <2 yrs prior to the baseline study and nonsmokers are never smokers and ex-smokers who stopped smoking >2 yrs prior to the baseline study. *: p<0.05 between smoking and non-smoking within sex and occupation class (woodworker or reference worker); §: p<0.05 between female woodworkers and female smoking reference workers (both p-values were calculated using t-tests).