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| Variable | Filter OFF | Filter ON | p value |
|---|---|---|---|
| Temperature (℃) | 29.72±1.89 | 29.63±2.75 | 0.543 |
| Relative humidity (%) | 34.68±7.38 34 | 22±7.88 | 0.347 |
| CO2 (ppm) | 743.48±273.91 | 756.87±254.47 | 0.443 |
| PM2.5 (μg/m3) | 17.00±9.58 | 9.26±7.20 | <0.001 |
Values are presented as a mean±standard deviation.
