Characteristics of pesticide use in a pesticide applicator cohort: The Agricultural Health Study

Data on recent and historic pesticide use, pesticide application methods, a nd farm characteristics were collected from 35,879 restricted-use pesticide applicators in the first 2 years of the Agricultural Health Study, a prosp ective study of a large cohort of private and commercial licensed pesticide applicators that is being conducted in Iowa and North Carolina. (In Iowa, applicators are actually "certified," while in North Carolina they are "lic ensed"; for ease of reference the term license will be used for both states in this paper.) Commercial applicators (studied in Iowa only) apply pestic ides more days per year than private applicators in either state. When the types of pesticides being used by different groups are compared using the S pearman coefficient of determination (r(2)), we find that Iowa private and Iowa commercial applicators tend to use the same type of pesticides (r(2) = 0.88). White and non-white private applicators tended to use the same type of pesticides (North Carolina r(2) = 0.89), as did male and female private applicators (Iowa r(2) = 0.85 and North Carolina r(2) = 0.84). There was l ess similarity (r(2) = 0.50) between the types of pesticides being used by Iowa and North Carolina private applicators. A greater portion of Iowa priv ate applicators use personal protective equipment than do North Carolina pr ivate applicators, and pesticide application methods varied by state. This heterogeneity in potential exposures to pesticides between states should be useful for subsequent epidemiologic analyses using internal comparison gro ups. (C) 1999 Academic Press.