2021 Yes https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(21)02215-4 Lin, Ziqiang Europe Exposure Study Modeling Students Elementary (K-5) High School (9-12) Respiratory symptoms Children Exposure Health outcomes Logistic regression Machine learning About one-third of the participants reported at least one health symptom in the past week. The most common respiratory symptoms reported among Romanian school children were the flu-like symptoms (30.4%), the most frequent being runny nose (20%). The second prevalent respiratory symptoms were ‘asthma-like symptoms’ (19.6%), with dry cough as the most reported symptom among participants (20%). Additionally, the prevalence of ‘allergy-like symptoms’ was 17.5%, among which, sneeze (11%) was most commonly reported. In summary, the prevalence of any respiratory symptoms was 39.3% among study participants.