Table 3.
Correlation coefficient (p value) for environmental factors
| Fine particles | Protein (fine particles) | Endotoxin (fine particles) | Coarse particles | Protein (coarse particles) | Endotoxin (coarse particles) | Temperature | Relative humidity | Wind speed | Air pressure | |
|---|---|---|---|---|---|---|---|---|---|---|
| Fine particles | 1.00 | |||||||||
| Protein (fine particles) | 0.654 (< 0.001) | 1.00 | ||||||||
| Endotoxin (fine particles) | 0.212 (0.064) | 0.331 (0.003) | 1.00 | |||||||
| Coarse particles | 0.551 (< 0.001) | 0.175 (0.128) | 0.134 (0.246) | 1.00 | ||||||
| Protein (coarse particles) | 0.233 (0.041) | 0.169 (0.142) | 0.045 (0.695) | 0.357 (0.001) | 1.00 | |||||
| Endotoxin (coarse particles) | − 0.104 (0.367) | − 0.085 (0.465) | 0.474 (< 0.001) | 0.187 (0.103) | 0.498 (< 0.001) | 1.00 | ||||
| Temperature | 0.015 (0.897) | − 0.045 (0.698) | 0.218 (0.057) | 0.244 (0.032) | 0.592 (< 0.001) | 0.633 (< 0.001) | 1.00 | |||
| Relative humidity | − 0.548 (< 0.001) | − 0.516 (< 0.001) | − 0.523 (< 0.001) | − 0.187 (0.103) | 0.015 (0.897) | − 0.006 (0.960) | − 0.033 (0.779) | 1.00 | ||
| Wind speed | 0.026 (0.822) | 0.037 (0.750) | 0.088 (0.445) | 0.020 (0.860) | 0.104 (0.366) | 0.081 (0.485) | 0.082 (0.476) | − 0.367 (0.001) | 1.00 | |
| Air pressure | 0.043 (0.709) | 0.176 (0.126) | − 0.102 (0.378) | − 0.135 (0.240) | − 0.567 (< 0.001) | − 0.463 (< 0.001) | − 0.511 (< 0.001) | 0.008 (0.944) | − 0.294 (0.009) | 1.00 |
Correlation coefficient (p value) was calculated with the weekly levels of airborne particles, protein, endotoxin, temperature, relative humidity, wind speed, and air pressure. Statistically significant, p < 0.05