Table 6.
Formaldehyde, benzene, PAHs, and TVOC concentration differences by school level
| School level | PAHs (ng/m3) |
Naphthalene (ng/m3) |
Formaldehyde (ug/m3) |
Benzene (ug/m3) |
TVOC (ug/m3) |
|||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N | AM∗ | SD | P | N | AM | SD | P | N | AM | SD | P | N | AM | SD | p | N | AM | SD | P | |
| Elementary | 20 | 574.48 | 558.05 | 0.005∗ | 20 | 456.81 | 358.70 | 0.005∗ | 20 | 7.33 | 4.17 | 0.01∗ | 20 | 11.31 | 8.31 | 0.22 | 20 | 106.19 | 72.15 | 0.50∗ |
| Middle | 13 | 124.29 | 76.15 | 13 | 122.01 | 74.85 | 13 | 3.91 | 3.98 | 13 | 9.25 | 3.84 | 13 | 73.57 | 39.79 | |||||
| High | 13 | 308.04 | 329.98 | 13 | 277.17 | 283.85 | 13 | 7.70 | 4.44 | 13 | 15.61 | 11.32 | 13 | 283.31 | 602.11 | |||||
※ Kruskal–wallis-test, k-independent sample, ordinal, ∗ p < 0.05.
∗
Arithmetric means.