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Weather and climate are known to infl uence human health. Seasonal changes of temperature promote alterations in respiratory morbidity and in total and cause-specific mortality. Data on the prevalence of asthma and asthma-related symptoms and its disparities between winter and summer in the acid rain-plagued city of Zunyi in southwestern China have not been widely available. In order to describe the epidemiology of asthma and asthma-related symptoms and its prevalence changes between winter and summer, we have completed two cross-sectional surveys of people aged ≥18 years in winter and summer in the innercity areas of Zunyi city, Guizhou Province, China. The subjects were selected using a simple random sampling method. Data on asthma and asthma-related symptoms and selected home environmental factors were assessed by questionnaire. The studied Chinese adult population residing in Zunyi recorded a lower prevalence rate of asthma than those of Western countries. There was signifi cant difference in asthma prevalence among adult respondents between winter (1.8%) and summer (0.8%) in inner-city Zunyi. Asthma and asthma-related symptoms occurred more frequently in winter than summer, and that difference mainly correlated with environmental risk exposures, including coal combustion, frequency of stove cooking, fan or range hood usage, mattress material, pet possession, must and mould in the bedroom, etc. The prevalence of adult asthma and asthma-related symptoms was higher in winter compared to the summer in Zunyi, China. Our study suggests that asthma may be an important component of the public health burden of indoor air pollution, especially in winter.
There is increasing evidence for a possible association between asthma and asthma-related symptoms and indoor environmental quality in developing countries. Data on the prevalence of asthma and asthma-related symptoms and its association to personal, occupational, and environmental risk factors among adults in the acid rain-plagued city of Zunyi in southwestern China have not been widely available. A multistage cluster random sampling method was performed in populations aged 18 years and above in 11 inner-city areas of Zunyi in Guizhou province in winter (from October 2011 to March 2012). A modified adult questionnaire of the European Community Respiratory Health Survey II translated into Chinese was administered to adults in order to collect data on asthma and asthma-related symptoms and selected home environmental factors. The overall prevalence of adult asthma, asthma and asthma-related symptoms were 1.8% and 13.1%, respectively. Coal (OR = 1.893; 95% CI, 1.157-3.097), cooking oil fumes (OR = 2.218; 95% CI, 1.466-3.356), current smokers (OR = 4.201; 95% CI, 2.647-6.667), secondhand smoke (OR = 3.654; 95% CI, 1.341-4.343) and pets keeping (OR = 2.170; 95% CI, 1.424-3.308) were independently associated with the occurrence of adult asthma and asthma-related symptoms. The prevalence of adult asthma was lower than those reported by European and American studies, but closer to those of previous Chinese studies. The risks of asthma and asthma-related symptoms in this population were associated with exposure to coal, cooking smoke, cooking oil fumes, and secondhand smoke and pets, among other risk factors.
Zunyi is a city seriously polluted by acid rain in southwest China. Few studies have been performed in the region to investigate the respiratory health impact of meteorological conditions. In this study, we did an ecological time-series study to examine the association between climatic parameters (mainly of temperature) and daily numbers of hospital outpatient visits for respiratory diseases in Zunyi. Daily pulmonary morbidity and meteorological data from 1 January 2007 to 1 January 2010 in Zunyi were obtained. A generalized additive model (GAM) in a Poisson regression was used to model the relationship between air temperature and pulmonary morbidity. For respiratory admissions, there was a linear association. For a 1ºC increase in daily average temperature below a threshold (10ºC), the number of hospital outpatient visits for respiratory morbidity increased by 1.05009331-fold, whereas for a 1ºC increase in daily average temperature above a threshold (10ºC), the number of hospital outpatient visits for respiratory morbidity decreased by 0.99032897-fold over the past year. Our study offers the first statistically significant evidence in an acid rain-plagued region of China that ambient air temperature has an adverse effect on population respiratory health. The effects should be considered in planning health actions to prevent respiratory diseases and minimize the established health risks.
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