Lung function variables in waste collectors
| Lung function variables | Arithmetic mean | sd |
| FEV1 % pred# | 90.1 | 10.5 |
| FVC % pred# | 99.6 | 13.4 |
| FEV1/FVC % | 80.3 | 12.7 |
| Δ FEV1¶ L | −0.12* | 0.2 |
| Δ FEV1/FVC%¶ | −1.34** | 3.9 |
| Δ FEV1 % pred¶ | −3.0* | 4.4 |
FEV1: forced expiratory volume in one second
% pred: % predicted
FVC: forced vital capacity
#: lung function on Monday morning before the work shift compared with the European Respiratory Society standard population (never-smokers, without symptoms, age 18–70 yrs)
¶: difference between Thursday and Monday morning
*: p<0.05
**: p<0.01 (Wilcoxon signed-rank test). n=24