Table 2.
Day and overnight environmental measures distribution (mean, standard deviation (SD) and range) for portable and traditional classrooms
| Portable (n = 9) | Tradition (n = 3) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Day | Mean | Median | SD | Min | Max | Mean | Median | SD | Min | Max |
| Formaldehyde (PPM) | 0.016 | 0.011 | 0.011 | 0.0068 | 0.034 | 0.019 | 0.016 | 0.009 | 0.012 | 0.029 |
| CO2 (PPM) (1) | 890 | 780 | 440 | 480 | 1800 | 1300 | 1400 | 216 | 1000 | 1400 |
| Temperature (C) | 21.4 | 1.4 | 19.5 | 23.4 | 22.3 | 1 | 21.3 | 23.3 | ||
| RH (%) | 48 | 10.6 | 37.7 | 69.7 | 47.3 | 10.3 | 38.8 | 58.8 | ||
| Overnight | Mean | Median | SD | Min | Max | Mean | Median | SD | Min | Max |
|---|---|---|---|---|---|---|---|---|---|---|
| Formaldehyde (PPM) | 0.022 | 0.018 | 0.011 | 0.0073 | 0.038 | 0.022 | 0.019 | 0.014 | 0.01 | 0.038 |
| CO2 (PPM) (2) | 560 | 580 | 72 | 470 | 680 | 610 | 540 | 166 | 480 | 790 |
| Temperature (C) | 25.3 | 1.9 | 22.2 | 27.4 | 25.1 | 1.4 | 24.1 | 23.3 | ||
| RH (%) | 43.6 | 5.2 | 37.3 | 53.9 | 38.2 | 3.2 | 35.8 | 58.8 |
Footnotes
(1) CO2 measured at 4:00 PM
(2) CO2 measured at 7:00 AM
RH = relative humidity