Prevalence of asthma, rhinitis and eczema among 13–14-year-old schoolchildren in Tochigi, Japan

ABSTRACTTo analyze the prevalence and severity of asthma, rhinitis and eczema in children living in different countries, the International Study of Asthma and Allergies in Childhood (ISAAC) was developed. The ISAAC Phase One study evaluated approximately 720 000 children in 56 countries, including Japan. In late 1995 and early 1996, we administered the ISAAC questionnaire to 4466 schoolchildren aged 13–14 years of age in 24 schools in Utsunomiya City and Tochigi City (both in Tochigi Prefecture, Japan). With regard to asthma, the reported prevalence of wheezing in the preceding 12 months was 8.4%, of frequent wheezing attacks 0.6% and of wheezing with sleep disturbance 0.5%. The prevalence in the preceding 12 months of rhinitis was 42.1% and of rhinoconjunctivitis was 21.5%. Nasal symptoms were most frequent in April (19.9%) and least frequent in July (5.6%). The prevalence of atopic eczema in the prior 12 months was 9.6% and atopic eczema with sleep disturbance was 0.6%. All prevalence values were slightly increased in Utsunomiya City, the largest city in Tochigi Prefecture, in comparison with Tochigi City. In conclusion, in Japanese cities, 33.3% of children had some allergic symptoms and 2.4% of children reported severe allergic symptoms