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Table 1 PCE exposure history of breast cancer cases and controls

From: Risk of breast cancer following exposure to tetrachloroethylene-contaminated drinking water in Cape Cod, Massachusetts: reanalysis of a case-control study using a modified exposure assessment

  PCE-exposed cases PCE-exposed controls
Latency period (years) Prior analysis (n = 930) Current analysis (n = 920) Prior analysis (n = 1302) Current Analysis (n = 1293)
0 191 (20.5%) 449 (48.8%) 217 (16.7%) 648 (50.1%)
5 154 (16.6%) 399 (43.4%) 163 (12.5%) 552 (42.7%)
7 128 (13.8%) 365 (39.7%) 135 (10.4%) 496 (38.4%)
9 111 (11.9%) 319 (34.7%) 110 (8.4%) 436 (33.7%)
11 86 (9.2%) 281 (30.5%) 83 (6.4%) 376 (29.1%)
13 65 (7.0%) 242 (26.3%) 52 (4.0%) 325 (25.1%)
15 44 (4.7%) 186 (20.2%) 35 (2.7%) 229 (17.7%)
17 21 (2.3%) 130 (14.1%) 21 (1.6%) 141 (10.9%)
19 9 (1.0%) 84 (9.1%) 9 (0.7%) 78 (6.0%)