title: Inferring past pesticide exposures: a matrix of individual active ingredients in home and garden pesticides used in past decades.
abstract: BACKGROUND
  In retrospective studies of the health effects of home and garden pesticides, self-reported information typically forms the basis for exposure assessment. Study participants generally find it easier to remember the types of pests treated than the specific pesticides used. However, if the goal of the study is to assess disease risk from specific chemicals, the investigator must be able to link the pest type treated with specific chemicals or products.
  
  
  OBJECTIVE
  Our goal was to develop a "pesticide-exposure matrix" that would list active ingredients on the market for treating different types of pests in past years, and provide an estimate of the probability that each active ingredient was used.
  
  
  METHODS
  We used several different methods for deriving the active ingredient lists and estimating the probabilities. These methods are described in this article, along with a sample calculation and data sources for each.
  
  
  RESULTS
  The pesticide-exposure matrix lists active ingredients and their probabilities of use for 96 distinct scenarios defined by year (1976, 1980, 1990, 2000), applicator type (consumer, professional), and pest type (12 categories). Calculations and data sources for all 96 scenarios are provided online.
  
  
  CONCLUSIONS
  Although we are confident that the active ingredient lists are reasonably accurate for most scenarios, we acknowledge possible sources of error in the probability estimates. Despite these limitations, the pesticide-exposure matrix should provide valuable information to researchers interested in the chronic health effects of residential pesticide exposure.
authors: Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892, USA. coltj@mail.nih.gov
authors: Joanne S
authors: JS
authors: Colt
authors: Mancer J
authors: MJ
authors: Cyr
authors: Shelia H
authors: SH
authors: Zahm
authors: Geoffrey S
authors: GS
authors: Tobias
authors: Patricia
authors: P
authors: Hartge
mesh_terms: D004781:Environmental Exposure / Q000032:analysis* / Q000145:classification; D051639:Gardening; D006801:Humans; D010571:Pest Control; D010575:Pesticides / Q000032:analysis* / Q000737:chemistry / Q000145:classification; D011336:Probability; D012189:Retrospective Studies; D018570:Risk Assessment / Q000379:methods
chemical_list: D010575:Pesticides