We have recently guided the data analysis for several projects, primarily 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. Another project is probing a possible relationship between pesticide exposure and depression among male private applicators in the AHS. We used inverse probability weighting to account for exclusions due to missing data and polytomous logistic regression to estimate odds ratios. Ever use of fumigants as a class and several individual pesticides were associated with depression. Using data from the AHS, we have also studied whether farming exposures contribute to exacerbation of asthma. We noted inverse association of asthma with several farming activities and with ever use of two herbicides but no positive associations (except in a subset of cases with asthma and allergy). These observations are consistent with the possibility that asthma cases prone to exacerbation tend to avoid exposures that trigger symptoms. A last project using data from the AHS examined the possible relationship between diabetes and ever use of specific pesticides before enrollment. Using age as the time scale and diagnosis with diabetes as the event of interest, we fit Cox proportional hazards models to estimate hazard ratios. Ever use of five pesticides (three of them organophosphates) were associated with diabetes among farmers wives who reported ever mixing or applying pesticides.
| Shrestha, Srishti; Parks, Christine G; Goldner, Whitney S et al. (2018) Incident thyroid disease in female spouses of private pesticide applicators. Environ Int 118:282-292 |
| Lee, Mi Kyeong; Carnes, Megan U; Butz, Natasha et al. (2018) Exposures Related to House Dust Microbiota in a U.S. Farming Population. Environ Health Perspect 126:067001 |
| Bernhardt, Miranda L; Stein, Paula; Carvacho, Ingrid et al. (2018) TRPM7 and CaV3.2 channels mediate Ca2+ influx required for egg activation at fertilization. Proc Natl Acad Sci U S A 115:E10370-E10378 |
| Wyss, Annah B; House, John S; Hoppin, Jane A et al. (2018) Raw milk consumption and other early-life farm exposures and adult pulmonary function in the Agricultural Lung Health Study. Thorax 73:279-282 |
| Baumert, Brittney O; Carnes, Megan Ulmer; Hoppin, Jane A et al. (2018) Sleep apnea and pesticide exposure in a study of US farmers. Sleep Health 4:20-26 |
| Li, Yuanyuan; Umbach, David M; Li, Leping (2017) Putative genomic characteristics of BRAF V600K versus V600E cutaneous melanoma. Melanoma Res 27:527-535 |
| 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 |
| Beard, John D; Engel, Lawrence S; Richardson, David B et al. (2017) Military service, deployments, and exposures in relation to amyotrophic lateral sclerosis survival. PLoS One 12:e0185751 |
| 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 |
| 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 |
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