Abstract
A questionnaire survey was conducted of elementary school students (6-12 years of age) in Joetsu City for multiple chemical sensitivity-like symptoms (MCS-like symptoms) in July, 2005. In July, 2010, 5 years after the first survey, a resurvey of elementary and junior high school students (6-15 years of age) was carried out in order to assess any temporal changes. The number of valid responses was 14,024, representing 84.0% of the total number of students. The results showed that the number of students with MCS-like symptoms was 1,734 (12.4%) of the total number of resurvey respondents. The following results were highlighted: (1) The propotion of school students with MCS-like symptoms becomes greater with age. (2) The propotion of the total of elementary school students with MCS-like symptoms is greater than previously calculated. (3) Students from the third grade of elementary to the third grade of junior high schools with MCS-like symptoms tend to go to bed later than the other students.
