2024 No Analyzing symptom data in indoor air questionnaires for primary schools https://pubmed.ncbi.nlm.nih.gov/28267226/ Ung-Lanki, S. Europe Modeling Other Elementary (K-5) Respiratory symptoms Vision Headaches Stress/Anxiety Indoor environment Primary schools Principal component analysis Questionnaire Symptom score Symptoms Parent surveys in 10 Finnish schools assessed child symptoms linked to indoor air. Six symptom scores were developed; four simple dichotomized scores effectively captured school-level differences, aiding future air quality monitoring. 2017