Fig 1. Extraction of subjects in the adjunct study of the Japan Environment and Children’s Study (JECS).

Of 7,829 JECS participants as of May 2013 in Kyoto, Toyama, and Tottori, 4,178 participants presented informed consent to the adjunct study, and 3,327 participants responded to symptom questionnaire during the Asian dust season. Of them, we extracted responses of 1,745 participants that were answered within 3 months after their blood-sampling.