Table 1.

Prevalence of self-reported respiratory symptoms, atopy and headache among Korean pupils

^*Subjects participated for both questionnaire and belonged to the classrooms where indoor measurements performed; ^†Difference by sex calculated by chi-square test for four-fold contingency tables; ^‡Current asthma medication and/or asthma attacks during the last 12 months; ^§Allergy to pollen and/or furry pets; ^∥One to four times a week or everyday in the preceding 3 months.