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Table 1 Selection, enrollment, and initial and final exposure status of study subjects

From: Occurrence of mental illness following prenatal and early childhood exposure to tetrachloroethylene (PCE)-contaminated drinking water: a retrospective cohort study

  Initial Exposure Status  
  Index Subject Older Sibling  
  Exposed Unexposed Unexposed Total
Selected 1910 1928 1202 5040
Excluded during enrollment     
Deceased 35 40 36 111
   Parent refused participation 199 148 80 427
   Never located 113 149 70 332
   No response 871 887 536 2294
   Refused 73 78 36 187
Returned questionnaire 619 626 444 1689
   Percent of selected 32.4% 32.5% 36.9% 33.5%
   Percent of located 39.6% 39.3% 43.7% 40.5%
Excluded during exposure assessment     
   Inadequate residential history 15 37 29 81
Off-Cape address in
town with VL/AC pipes
19 27 50 96
Available for analysis 585 562 365 1512
Percent of selected 30.6% 29.1% 30.4% 30.0%
Final exposure status     
Both prenatal and early
childhood exposure
561 160 110 831
Only early childhood
exposure
7 42 85 134
   Unexposed 17 360 170 547
   Total 585 562 365 1512