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Table 1 Number of subjects by proxy/non-proxy, PCE-exposed/unexposed, and case/control status.

From: Impact of tetrachloroethylene-contaminated drinking water on the risk of breast cancer: Using a dose model to assess exposure in a case-control study

 

Non-Proxy Subjects

Proxy Subjects

Total Subjects

PCE-exposed

189

102

291

   Cases

101

54

155

   Controls

88

48

136

Unexposed

696

301

997

   Cases

360

157

517

   Controls

336

144

480

Total

885

403

1288

   Cases

461

211

672

   Controls

424

192

616