Association between traffic-related air pollution and asthma in preschool children in a national Japanese nested case-control study

• 佐藤, 俊哉

• Sato, Tosiya

• Iwata, Tsutomu

• Kohno, Yoichi

• Nitta, Hiroshi

• Odajima, Hiroshi

• Ohara, Toshimasa

• Omori, Takashi

• Ono, Masaji

• Yamazaki, Shin

• Shima, Masayuki

抄録

Objectives: There has been little study on the effect of traffic-related air pollution on the incidence and persistence of asthma in preschool children. We evaluated the association of exposure to traffic-related air pollution with the incidence/persistence of asthma during the first 3 years of life using a population-based study. Methods: A baseline survey was conducted in 1 1/2-year-old children (n=63 266). A follow-up survey at 3 years of age (n=43 343) identified new-onset asthma cases (n=853) and persistence of asthma (n=214). In the prevalence/persistence study, the outdoor concentrations of nitrogen oxides (NOx) and elemental carbon (EC) at home during the first 1 1/2 years of life were estimated by a dispersion model. In the nested case-control study, which regarded incidence of asthma as cases, the personal exposure levels were estimated by dispersion model including time-activity pattern. Results: There was no statistically significant association between the incidence of asthma between age 1 1/2 and 3 years and personal exposure levels to NOx nor EC. However, the persistence of asthmatic symptoms (between 1 1/2 and 3 years) was significantly associated with outdoor concentrations of NOx. ORs for the persistence of asthmatic symptoms were 6.02 (95% CI 1.51 to 23.92) for the comparison between the upper 5th and lower 25th centiles of NOx. Conclusions: While no statistically significant association was observed for the incidence of asthma, the persistence of asthmatic symptoms in preschool children was significantly associated with traffic-related air pollution. This supports its importance as a risk factor in childhood airway disease.

収録刊行物

• BMJ Open

  BMJ Open 6 (2), 2016-02-25

  BMJ Publishing Group

詳細情報

• CRID: 1050564285789125376
• NII論文ID: 120005822741
• ISSN: 20446055
• HANDLE: 2433/216124
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles