Comparison of the Effects of Air Pollution on Outpatient and Inpatient Visits for Asthma: A Population-Based Study in TaiwanReportar como inadecuado

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A nationwide asthma survey on the effects of air pollution is lacking in Taiwan. The purpose of this study was to evaluate the time trend and the relationship between air pollution and health care services for asthma in Taiwan.


Health care services for asthma and ambient air pollution data were obtained from the National Health Insurance Research database and Environmental Protection Administration from 2000 through 2009, respectively. Health care services, including those related to the outpatient and inpatient visits were compared according to the concentration of air pollutants.


The number of asthma-patient visits to health-care facilities continue to increase in Taiwan. Relative to the respective lowest quartile of air pollutants, the adjusted relative risks RRs of the outpatient visits in the highest quartile were 1.10 P-trend  = 0.013 for carbon monoxide CO, 1.10 P-trend  = 0.015 for nitrogen dioxide NO2, and 1.20 P-trend <0.0001 for particulate matter with an aerodynamic diameter ≦10µm PM10 in the child group aged 0–18. For adults aged 19–44, the RRs of outpatient visits were 1.13 P-trend = 0.078 for CO, 1.17 P-trend = 0.002 for NO2, and 1.13 P-trend <0.0001 for PM10. For adults aged 45–64, the RRs of outpatient visits were 1.15 P-trend = 0.003 for CO, 1.19 P-trend = 0.0002 for NO2, and 1.10 P-trend = 0.001 for PM10. For the elderly aged≥ 65, the RRs of outpatient visits in were 1.12 P-trend  = 0.003 for NO2 and 1.10 P-trend  = 0.006 for PM10. For inpatient visits, the RRs across quartiles of CO level were 1.00, 1.70, 1.92, and 1.86 P-trend  = 0.0001 in the child group. There were no significant linear associations between inpatient visits and air pollutants in other groups.


There were positive associations between CO levels and childhood inpatient visits as well as NO2, CO and PM10 and outpatient visits.

Autor: Hui-Hsien Pan , Chun-Tzu Chen , Hai-Lun Sun, Min-Sho Ku, Pei-Fen Liao, Ko-Hsiu Lu, Ji-Nan Sheu, Jing-Yang Huang, Jar-Yuan Pai, Ko



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