We have recently guided the data analysis for two projects, both involving data from the Agricultural Health Study (AHS), a cohort of licensed pesticide applicators (mostly farmers) from Iowa and North Carolina. In the first project, we sought to assess whether injury mortality was associated with pesticide-use practices among male farmer applicators in the AHS. From 1993 to 2008, we observed 338 injury fatalities over 727,543 person-years of follow-up. We used Cox proportional hazards modeling to study the association of fatal injury with use of specific pesticides, personal protective equipment, specific types of farm equipment, and other factors. Exposure information was collected at enrollment, from 1 to 15 years preceding death. Fatal injury increased with the number of days per year that a farmer applied pesticides and decreased with use of chemical-resistant gloves. Certain herbicides were associated with fatal injury. We regard these associations as deserving of further study, especially with better data on the temporal relationship of exposure and death, and we emphasize that these results must be interpreted with caution. Organophosphorous insecticides (OPs) are among the most commonly used insecticides in the US. In the second project, we characterized the use of OPs among farmer pesticide applicators in the AHS. For this effort, we assessed lifetime use of OPs among 701 farmer applicators who were recruited for a neurological testing study with augmented informaton about OP use. This sample was randomly selected in complex sampling design that oversampled highly exposed individuals (based on the usual AHS data) and restricted to individuals residing within 150 miles of four clinical sites. We used empirical sampling weights so that our estimates reflect the OP experience of all 3863 male applicators eligible for the neurological study. Malathion and chlorpyriphos were the most commonly used OPs. OP use declined over the 15 year course of the AHS.

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House, John S; Wyss, Annah B; Hoppin, Jane A et al. (2017) Early-life farm exposures and adult asthma and atopy in the Agricultural Lung Health Study. J Allergy Clin Immunol 140:249-256.e14
Hoppin, Jane A; Umbach, David M; Long, Stuart et al. (2017) Pesticides are Associated with Allergic and Non-Allergic Wheeze among Male Farmers. Environ Health Perspect 125:535-543
Wyss, Annah B; House, John S; Hoppin, Jane A et al. (2017) Raw milk consumption and other early-life farm exposures and adult pulmonary function in the Agricultural Lung Health Study. Thorax :
Carnes, Megan Ulmer; Hoppin, Jane A; Metwali, Nervana et al. (2017) House Dust Endotoxin Levels Are Associated with Adult Asthma in a U.S. Farming Population. Ann Am Thorac Soc 14:324-331
Harmon, Quaker E; Umbach, David M; Baird, Donna D (2016) Use of Estrogen-Containing Contraception Is Associated With Increased Concentrations of 25-Hydroxy Vitamin D. J Clin Endocrinol Metab 101:3370-7
Upson, Kristen; Harmon, Quaker E; Laughlin-Tommaso, Shannon K et al. (2016) Soy-based Infant Formula Feeding and Heavy Menstrual Bleeding Among Young African American Women. Epidemiology 27:716-25
Xu, Meng Yuan; Umbach, David M; Murphy, Eleanor et al. (2015) A Novel Mixture Model to Estimate the Time to Drug Effect Onset and Its Association with Covariates. Hum Hered 80:90-9
Beard, John D; Umbach, David M; Hoppin, Jane A et al. (2014) Pesticide exposure and depression among male private pesticide applicators in the agricultural health study. Environ Health Perspect 122:984-91
Hoppin, Jane A; Umbach, David M; Long, Stuart et al. (2014) Respiratory disease in United States farmers. Occup Environ Med 71:484-91
Henneberger, Paul K; Liang, Xiaoming; London, Stephanie J et al. (2014) Exacerbation of symptoms in agricultural pesticide applicators with asthma. Int Arch Occup Environ Health 87:423-32

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