European Heart Journal Advance Access originally published online on March 14, 2006
European Heart Journal 2006 27(10):1238-1244; doi:10.1093/eurheartj/ehi835
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Urban air pollution and emergency admissions for cerebrovascular diseases in Taipei, Taiwan
1 Institute of Occupational Medicine and Industrial Hygiene, College of Public Health, National Taiwan University, Rm. 722, 7F, No. 17, Xu-Zhou Road, Taipei 100, Taiwan, R.O.C.
2 Department of Emergency Medicine, National Taiwan University Hospital, Taipei, Taiwan, R.O.C.
Received 22 August 2005; revised 13 February 2006; accepted 23 February 2006; online publish-ahead-of-print 14 March 2006.
* Corresponding author. Tel/fax: +886 2 2322 2362. E-mail address: ccchan{at}ntu.edu.tw
Aims This study was designed to evaluate the association between urban air pollutants and emergency admissions for cerebrovascular diseases.
Methods and results Daily emergency admissions for cerebrovascular diseases (ICD-9-CM, 430–437) to the National Taiwan University Hospital were regressed against daily concentrations of carbon monoxide (CO), nitrogen dioxide (NO2), sulphur dioxide (SO2), ozone (O3), and particulate matters with aerodynamic diameter <2.5 (PM2.5) and 10 µm (PM10) from 12 April 1997 to 31 December 2002 in Taipei metropolitan areas by the Poisson regression models adjusting for meteorological conditions and temporal trends. Single-pollutant models showed O3 lagged 0 day, CO lagged 2 days, and PM2.5 and PM10 lagged 3 days were significantly associated with increasing emergency admissions for cerebrovascular diseases and CO lagged 2 days was significantly associated with increasing emergency admissions for strokes (ICD-9-CM, 430–434). Such association remained significant for O3, CO, and cerebrovascular admissions after adjusting for PM2.5 and PM10 in two-pollutant models. The odds ratios were 1.021–1.022 per 31.3 ppb O3 and 1.023–1.031 per 0.8 ppm CO, respectively. However, only CO was significantly associated with emergency admissions for stroke in the three-pollutant models with CO, O3, and PM2.5 or PM10.
Conclusion Emergency admissions for cerebrovascular diseases among adults were positively associated with increasing urban air pollution levels of O3 lagged 0 day and CO lagged 2 days in Taipei.
Key Words: Cerebrovascular diseases • Stroke • Air pollution • Carbon monoxide • Particulate matters • Epidemiology
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