Table 2.
Spirometry results
| Parameter | Unit | nm | sm | ffpm | ANOVA | nm vs sm | nm vs. ffpm | sm vs ffpm |
|---|---|---|---|---|---|---|---|---|
| FVC | l | 6.1 ± 1.0 | 5.6 ± 1.0 | 5.3 ± 0.8 | < 0.001 | 0.003 | < 0.001 | 0.032 |
| FEV1 | l | 4.3 ± 0.7 | 4.0 ± 0.7 | 3.7 ± 0.6 | 0.001 | 0.001 | 0.003 | 0.068 |
| TIFF | % | 70.6 ± 9.7 | 71.2 ± 6.9 | 69.7 ± 4.9 | 0.635 | 0.934 | 0.900 | 0.520 |
| PEF | l/s | 9.7 ± 1.6 | 8.7 ± 1.4 | 7.5 ± 1.1 | < 0.001 | 0.026 | 0.001 | 0.040 |
Spirometry results of health volunteers wearing no mask (nm), a surgical mask (sm) and a FFP2/N95 mask (ffpm) depicted as mean ± standard deviation
Significant results are indicated in bold
FVC forced vital capacity, FEV1 forced expiratory volume in 1 s, TIFF Tiffenau index, PEF peak expiratory flow, l liter, s second