Symptom | Environmental factor | p Value |
Stuffy nose | ||
Runny nose | ||
Itchy eyes | Reduced relative humidity | <0.01 |
Dry throat | ||
Headache | Particulates (0.3–0.5 μm) | <0.001 |
Reduced relative humidity | <0.001 | |
Lethargy | Particulates (10 μm) | <0.01 |
Dry skin | Particulates (3–5 μm) | <0.001 |