title: Ability to trace migrant farmworkers ten years after initial identification in a Northern State (Wisconsin).
abstract: BACKGROUND
  Migrant farmworkers have rarely been included in epidemiologic studies. To assess the feasibility of following farmworkers over extended periods, a critical feature of many study designs, we attempted to trace a sample of Mexican-American farmworkers identified in a clinic in Wisconsin.
  
  
  METHODS
  We randomly chose 100 farmworkers from a migrant health center registration list for 1984-85. In 1995, we searched recent clinic records, made telephone calls, and visited migrant camps to find these farmworkers in Wisconsin during the growing season. We also attempted to find 46 farmworkers at their homes in southwest Texas over a two-week period in 1996 using the address listed in the clinic records, local phone books, and conversations with next-door neighbors.
  
  
  RESULTS
  Although 25 farmworkers had reregistered at the clinic in recent years, we found only 6 of them in Wisconsin in 1995. In southwest Texas, we either located or ascertained information about the vital status of 25 of the 46 farmworkers (54%).
  
  
  CONCLUSIONS
  Tracing efforts must include extensive contacts in farmworkers' home states and must incorporate a variety of information sources. Tracing farmworkers in epidemiologic studies appears to be feasible but requires more intensive methods over longer periods of time than those used in this study.
authors.affiliation: Department of Epidemiology and Biostatistics, Marshfield Medical Research and Education Foundation, A division of Marshfield Clinic, Marshfield, Wisconsin, USA. nordsdl@dhfs.state.wi.us
authors.forename: D L
authors.initials: DL
authors.lastname: Nordstrom
authors.forename: M
authors.initials: M
authors.lastname: Krauska
authors.forename: F
authors.initials: F
authors.lastname: DeStefano
authors.forename: J S
authors.initials: JS
authors.lastname: Colt
authors.forename: S H
authors.initials: SH
authors.lastname: Zahm
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000383:Agriculture / Q000706:statistics & numerical data*; D005240:Feasibility Studies; D005260:Female; D006630:Hispanic or Latino / Q000706:statistics & numerical data; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D011159:Population Surveillance / Q000379:methods*; D011795:Surveys and Questionnaires; D013781:Texas; D013997:Time Factors; D014171:Transients and Migrants / Q000706:statistics & numerical data*; D014922:Wisconsin