title: Predictors of PFOA levels in a community surrounding a chemical plant.
abstract: BACKGROUND
  Perfluorooctanoic acid (PFOA) is considered a probable human carcinogen by the U.S. Environmental Protection Agency. It does not exist in nature but has been used widely since World War II. It is present in the serum of most Americans at about 4-5 ng/mL, although the routes of exposure remain unknown.
  
  
  OBJECTIVE
  We examined predictors of PFOA in mid-Ohio Valley residents living near a chemical plant that until recently released large quantities of PFOA into the environment, contaminating drinking water.
  
  
  METHODS
  We studied 69,030 residents in six contaminated water districts who participated in a 2005-2006 survey involving a questionnaire and blood tests. Of these, 64,251 had complete data on PFOA and covariates. We also analyzed a subset (71%) for whom we had occupational history. We ran linear regression models to determine serum PFOA predictors.
  
  
  RESULTS
  Mean PFOA serum level was 83.0 ng/mL (median, 28.2). The most important predictors were current (median for all districts, 38.4; highest district, 224.1) and past (median, 18.6) residence in contaminated water districts, and current (median, 147.8) and past (median, 74.9) employment at the chemical plant (R(2) model = 0.55). PFOA was higher for males, those consuming local vegetables, and those using well water rather than public water, and lower for those using bottled water. PFOA was higher at younger and older ages.
  
  
  CONCLUSIONS
  PFOA levels in this population varied with distance of residence from the plant and employment at the plant. Effects of age and sex reflected prior findings. Effects of other demographic and lifestyle covariates were relatively weak.
authors: Rollins School of Public Health, Emory University, Atlanta, Georgia 30322, USA. nsteenl@sph.emory.edu
authors: Kyle
authors: K
authors: Steenland
authors: Chuangfang
authors: C
authors: Jin
authors: Jessica
authors: J
authors: MacNeil
authors: Cathy
authors: C
authors: Lally
authors: Alan
authors: A
authors: Ducatman
authors: Veronica
authors: V
authors: Vieira
authors: Tony
authors: T
authors: Fletcher
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002210:Caprylates / Q000097:blood*; D002617:Chemical Industry; D002648:Child; D002675:Child, Preschool; D005260:Female; D005466:Fluorocarbons / Q000097:blood*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D011795:Surveys and Questionnaires; D014481:United States; D014874:Water Pollutants, Chemical / Q000097:blood*; D055815:Young Adult
chemical_list: D002210:Caprylates; D005466:Fluorocarbons; D014874:Water Pollutants, Chemical; C023036:perfluorooctanoic acid