2016 No https://www.sciencedirect.com/science/article/abs/pii/S0048969721025699?via%3Dihub Kallvik Europe Students Elementary (K-5) Respiratory symptoms Hoarseness Children Indoor air problems Moisture damage Health symptoms School buildings The results showed a significant correlation between the degree of indoor air problem due to moisture damage and the frequency of hoarseness. Significant predictors for the child being hoarse every week or more often were dry cough, phlegm cough, and nasal congestion.