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Relative exposure to swine animal feeding operations and childhood asthma prevalence in an agricultural cohort

机译：在农业队列中相对暴露于猪动物饲养作业和儿童哮喘患病率

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Large swine animal feeding operations (AFOs) have become the model of livestock production throughout the United States. Epidemiological studies have consistently shown an increase in adverse respiratory symptoms among workers at AFOs. However, the impact on communities surrounding these facilities is still being investigated. We evaluated the association between relative environmental exposure to AFOs and the prevalence of prescribed medication for wheeze and/or childhood asthma in rural Iowa.Demographic and health information on 565 children aged 0 to 17 was obtained from a previous population-based cohort study while data on the AFOs was collected from publically available tax records. We created a metric ofeach child’s relative environmental exposure to swine CAFOs which incorporated the size of the AFO as well as distance and wind direction. We determined the association between self-reported prescription medication for wheeze and/or self-reported physician diagnosed asthmaand relative exposure while controlling for recognized risk factors using correlated logistic regression.The prevalence of childhood asthma in the cohort was 11.0% while 22.7% of children had been previously prescribed medication for wheeze or had a lifetime asthma diagnosis. Children with a larger relative environmental exposure to AFOs had a significantly increased odds of both outcomes (OR=1.51, p=0.014 asthma; OR=1.38, p=0.023 asthma or medication for wheeze). When stratified into exposure quartiles a linear trend was observed with asthma or medication for wheezeas the dependent variable but not with asthma alone. This study is the first to investigate children’s cumulative relative exposure to smaller AFOs and adds to the growing volume of literature supporting a link between proximity to swine AFOs and adverse respiratory health.
机译：大型猪动物饲养业务（AFO）已成为整个美国畜牧生产的典范。流行病学研究一直显示，AFO工人的呼吸道不良症状有所增加。但是，对这些设施周围社区的影响仍在调查中。我们评估了AFO的相对环境暴露与爱荷华州农村地区喘息和/或儿童哮喘的处方药普及率之间的关联。从以前的一项基于人群的队列研究中获得了565位0至17岁儿童的人口统计学和健康信息，而数据AFO上的税款是从公开的税收记录中收集的。我们创建了一个衡量每个孩子相对于猪CAFO的相对环境暴露的指标，该指标结合了AFO的大小以及距离和风向。我们通过相关Logistic回归确定了自我报告的用于治疗哮喘的处方药和/或自我报告的医生诊断为哮喘的患者与相对暴露（同时通过相关Logistic回归控制公认的危险因素）之间的相关性。儿童哮喘的患病率为11.0％，而儿童为22.7％以前曾开过喘息药或终生哮喘诊断药物。相对环境暴露于AFO较大的儿童，两种结局的几率均显着增加（OR = 1.51，p = 0.014哮喘； OR = 1.38，p = 0.023哮喘或喘息药）。当分层为暴露四分位数时，哮喘或药物治疗哮喘的线性趋势被观察到为因变量，但仅哮喘无此趋势。这项研究是第一个调查儿童对较小AFO的累积相对暴露的研究，并且增加了越来越多的文献来支持与猪AFO的接近性和不利的呼吸健康之间的联系。

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