Short-Term Effects of Air Pollution on Daily Emergency Visits for Asthma and Copd At Hospitals in Stockholm
2004 (English)In: The Sixteenth Conference of the International Society for Environmental Epidemiology (ISEE): Abstracts, Cambridge, MA: Blackwell Scientific Publications , 2004, Vol. 15, no 4, 58- p.Conference paper (Refereed)
A large number of studies have analysed air pollution effects on hospital admissions for respiratory diseases. Not so many have dealt with effects on emergency room visits. We have studied the associations between ambient pollution levels and emergency visits for asthma and Chronic Obstructive Pulmonary Disease (COPD) at seven hospitals in Greater Stockholm. Data on daily numbers of respiratory emergency visits, including ICD codes, were obtained from registers kept by the County council. We studied the period 1998-2002. Air pollution data were obtained from the main monitoring station, indicating the urban background concentration of PM10 (TEOM), NO2 and ozone. The daily pollen concentration from one measurement site in the city was also used. Weather data (temperature, relative humidity) were collected from an official weather station at the City airport. The mean concentration was 59 μg/m3 for ozone, 17 μg/m3 for NO2 and 16 μg/m3 for PM10. The mean daily number of emergency visits was 12 for asthma and 3 for COPD. Data were analysed using generalised additive models assuming an overdispersed Poisson model, and estimated using a quasi-likelihood approach. For asthma autoregressive terms were added to the model. We adjusted for season, day of week and weather. If the model was improved, we included also a pollen variable (asthma) and the number of influenza visits. The first analysis has been focussed on the effect of the mean air pollution levels during the last two days (lag 01). We used both single pollutant models, two pollutant models and finally a full model with the three pollutants included simultaneously. Ozone was significant in all COPD models, while the other pollutants never had any significant associations. In the full model the ozone effect was 3% per 10 μg/m3. For all asthma no pollutant had any significant effect, but for the largest subgroup (J45.9; unspecified asthma, here representing two thirds of the asthma visits) ozone significantly increased the number of visits. The estimate was about 2% per 10 μg/m3 in all models. These coefficients are rather high in comparison with other studies, but not high when compared with the ozone effect on respiratory hospital admissions in Stockholm. We conclude that ozone from an health point of view is an important air pollutant in this area.
Place, publisher, year, edition, pages
Cambridge, MA: Blackwell Scientific Publications , 2004. Vol. 15, no 4, 58- p.
, Epidemiology, ISSN 1044-3983 ; Vol 15. Nr. 4
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:umu:diva-46787OAI: oai:DiVA.org:umu-46787DiVA: diva2:440894
The Sixteenth Conference of the International Society for Environmental Epidemiology (ISEE), 1-4 Augusti 2004, Kimmel Center, New York University, New York, USA.