Swimming-pool workers (n=14): FEV1 (forced expiratory volume, litre during 1 s) and FEV% (FEV1×100/forced vital capacity) measured before and after 2 h exercise in filtered air and pool air, respectively. Mean±SD. Mean differences (before-after) within parentheses.
| Expiratory volume | Exposure in filtered air | Exposure in pool air | Difference in changes≠ | ||||
|---|---|---|---|---|---|---|---|
| before | after | mean difference Δ-values | before | after | mean difference Δ-values | ||
| FEV1 | 3.56±0.99 | 3.51±0.91 | (0.05)° | 3.59±0.93 | 3.57±0.92 | (0.014)° | Non-significant |
| FEV% | 78.86±6.3 | 78.43±5.42 | (0.43)° | 79.1±4.1 | 77.8±5.1 | (1.36)* | Non-significant |
*FEV% lower after exposure to pool air, p=0.003 (Wilcoxon signed rank test).
°Indicates no statistically significant difference.
≠Statistical significance of difference between Δ-values in filtered air and in pool air.