title: Effects of organophosphate insecticide residue variability on reentry intervals.
abstract: A stochastic simulation program was written to study the importance of residue variability in predicting excessive chronic (seasonal) cholinesterase (AChE) inhibition and acute illness among a cohort of agricultural harvesters grouped into crews exposed to AChE-inhibiting insecticides. It was concluded that residue variability can substantially affect the cohort's AChE level only for daily mean AChE inhibitions below 4% per day, increasing end-of-season mean AChE inhibition but actually decreasing the cohort's end-of-season variability. The incidence of acute individual and group (crew) AChE inhibitions in excess of that potentially producing clinical symptoms (assumed herein to be greater than 50% in a day), exhibits a fairly clear boundary as a function of a combination of the residue's mean and deviation. The predicted acute response accurately parallelled reported rates, thus validating the simulation model.
authors.affiliation: University of Iowa, Iowa City 52242.
authors.forename: W J
authors.initials: WJ
authors.lastname: Popendorf
mesh_terms: D000382:Agricultural Workers' Diseases / Q000139:chemically induced / Q000201:enzymology*; D002800:Cholinesterase Inhibitors / Q000506:poisoning*; D003198:Computer Simulation; D006801:Humans; D007306:Insecticides / Q000506:poisoning*; D008954:Models, Biological; D009943:Organophosphorus Compounds; D010573:Pesticide Residues / Q000506:poisoning*; D012621:Seasons; D013269:Stochastic Processes; D013997:Time Factors
chemical_list: D002800:Cholinesterase Inhibitors; D007306:Insecticides; D009943:Organophosphorus Compounds; D010573:Pesticide Residues