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Short-Term Fluctuations in Air Pollution and Asthma in Scania, Sweden: Is the Association Modified by Long-Term Concentrations?
Umeå universitet, Medicinska fakulteten, Institutionen för folkhälsa och klinisk medicin, Yrkes- och miljömedicin. Centre for Primary Health Care Research, Department of Clinical Science, Malmö, Lund University, Lund, Sweden.
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2016 (Engelska)Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 11, nr 11, artikel-id e0166614Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

BACKGROUND AND AIMS: Asthma is one of the most common respiratory diseases in the world. Research has shown that temporal increases in air pollution concentrations can aggravate asthma symptoms. The aim of this study was to assess whether individuals living in areas with higher air pollution concentrations responded differently to short-term temporal exposure to air pollution than those living in lower air pollution areas.

METHOD: The study was designed as a case-crossover study in Scania, Sweden. Outcome data was visits to primary health care clinics with asthma as the main complaint during the years 2007 to 2010. Nitrogen dioxide levels were obtained from 21 different air pollution monitoring stations. Short-term exposure was defined as the average concentration four days prior to the visit. Data was pooled for areas above and below a two-year average NO2 concentration of 10 μg/m3, dispersion modelled with an emission database.

RESULTS: The short-term association between NO2 and asthma visits seemed stronger in areas with NO2 levels below 10 μg/m3, with an odds ratio (OR) of 1.15 (95% confidence interval (CI): 1.08-1.23) associated with a 10 μg/m3 increase in NO2 compared to areas above 10 μg/m3 NO2 levels, where corresponding OR of 1.09 (95% CI: 1.02-1.17). However, this difference was not statistically significant. (p = 0.13).

CONCLUSIONS: The study provided some evidence, although not statistically significant, that short-term associations between air pollution and asthma may depend on background air pollution levels. However, we cannot rule out that the association is due to other spatially dependent factors in Scania. The study should be reproduced in other study areas.

Ort, förlag, år, upplaga, sidor
2016. Vol. 11, nr 11, artikel-id e0166614
Nationell ämneskategori
Arbetsmedicin och miljömedicin
Identifikatorer
URN: urn:nbn:se:umu:diva-128095DOI: 10.1371/journal.pone.0166614ISI: 000388350300077PubMedID: 27861543OAI: oai:DiVA.org:umu-128095DiVA, id: diva2:1048998
Tillgänglig från: 2016-11-23 Skapad: 2016-11-23 Senast uppdaterad: 2018-06-09Bibliografiskt granskad

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