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Table 1 Selection and Enrollment According to Women's PCE Exposure Status, Cape Cod, Massachusetts

From: Prenatal exposure to tetrachloroethylene-contaminated drinking water and the risk of congenital anomalies: a retrospective cohort study

  Initial Exposure Status*
  Number Exposed Number Unexposed Total Number
Selected 1,492 1,704 3,196
Excluded during
Enrollment
   
   Never located 132 136 268
   No response 245 336 581
   Ineligible or Deceased 7 8 15
   Refusal 149 137 286
Returned Questionnaire 959 1,087 2,046
% of selected 64.3% 63.8% 64.0%
% of located 70.5% 69.3% 69.9%
  1. *The exposure status was based on the initial visual assessment. See text for details.