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Intra- and inter-day repeatability: ethylene measurements.
| CO2 Experiments | Replicates before Wearing the mask | Average before Wearing the Mask (ppm) | SD before Wearing the Mask (ppm) | Rel. SD % | Replicates after Wearing the Mask | Average after Wearing the Mask (ppm) | SD after Wearing the Mask (ppm) | Rel. SD % |
|---|---|---|---|---|---|---|---|---|
| day 1 | 4 | 0.017 | 0.001 | 5.88 | 4 | 0.029 | 0.003 | 10.4 |
| day 2 | 4 | 0.018 | 0.002 | 11.12 | 4 | 0.023 | 0.003 | 13.1 |
| day 3 | 4 | 0.019 | 0.001 | 5.26 | 4 | 0.029 | 0.002 | 7 |
| inter-day | 12 | 0.018 | 0.0013 | 7.4 | 12 | 0.027 | 0.0028 | 10.3 |
