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Asthma is one of the most common chronic conditions affecting both children and adults. Examining the health effects of environmental triggers such as temperature variation may have implications for maintenance of asthma control and prevention. We hypothesized that large diurnal temperature range (DTR) might be a source of additional environmental stress and therefore a risk factor for asthma exacerbation. Daily meteorological data, air pollution concentrations and emergency hospital admissions for asthma from 2004 to 2011 in Hong Kong were collected. Poisson regression models were used to fit the relationship between daily DTR and asthma, after adjusting for the time trend, seasonality, mean temperature, humidity, and levels of outdoor air pollution. Acute adverse effect of DTR on asthma was observed. An increment of 1 °C in DTR over lag0 to lag4 days was associated with a 2.49% (95% CI: 1.86%, 3.14%) increase in daily emergency asthma hospitalizations. The association between DTR and asthma was robust on the adjustment for daily absolute temperature and air pollution. DTR exhibited significantly greater effect in cool season. Males and female children appeared to be more vulnerable to DTR. Results supported that greater temperature variation within a day was an environmental risk factor for asthma exacerbation.

Original publication

DOI

10.1016/j.scitotenv.2014.10.003

Type

Journal article

Journal

Sci Total Environ

Publication Date

01/02/2015

Volume

505

Pages

508 - 513

Keywords

Asthma, Diurnal temperature range, Emergency hospital admission, Temperature variation, Time series study, Adult, Asthma, Child, Female, Hong Kong, Hospitalization, Humans, Humidity, Male, Models, Theoretical, Patient Admission, Seasons, Temperature