Associations between air pollution, climate factors and outpatient visits for eczema in West China Hospital, Chengdu, Southwestern China: a time series analysis

Abstract

Background

Eczema is one of the most common inflammatory dermatoses that can be provoked as a result of external and internal factors. With dense population and rapid economic development of China, air pollution is still a serious problem and the prevalence of eczema has been elevating.

Objective

To determine the association and lagged effects between environmental factors and the outpatient visits for eczema.

Methods

Data of daily outpatient visits for eczema at the clinics of dermatology in West China Hospital within the last 5 years was collected. Data of environmental factors of Chengdu during the same period, including temperature, relative humidity, barometric pressure, wind speed and air pollutants concentrations like sulfur dioxide(SO₂), nitrogen dioxide(NO₂) and particular matter (PM₁₀) was gathered. The Distributed lag non-linear model were used to statistically examine the relationship between eczema and environmental factors and their lagged effects.

Results

Correlation analysis showed that eczema outpatient visits were positively correlated with the air pollutants and were negatively correlated with relative humidity. The barometric pressure and wind speed influenced the outpatient visits in association with air pollutants.

Conclusion

This study provides evidence that environmental factors like relative humidity, multiple air pollutants influence the incidence and prevalence of eczema and have lagged effects.

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