Table 2.
Distribution of selected confounders of breast cancer subjects (%) and RDDs of PCE-exposed controls.
| Characteristic | Non-Proxy Cases (n = 461) | Non-Proxy Controls (N = 424) | All Cases (n = 672) | All Controls (N = 616) |
| Age at diagnosis or index years | ||||
| 1–49 years | 19.7 (91) | 20.6 (87) | 16.5 (111) | 16.7 (103) |
| 50–59 years | 13.7 (63) | 17.0 (72) | 12.2 (82) | 13.6 (84) |
| 60–69 years | 33.0 (152) | 31.1 (132) | 31.5 (211) | 29.9 (184) |
| 70–79 years | 28.8 (133) | 25.2 (107) | 28.4 (191) | 26.0 (160) |
| 80+ years | 4.8 (22) | 6.1 (26) | 11.4 (77) | 13.8 (85) |
| Age at first birth or stillbirth | ||||
| < 30 years | 60.6 (279) | 65.7 (278) | 61.0 (410) | 66.8 (411) |
| 30+ years | 13.8 (64) | 12.4 (53) | 14.5 (97) | 12.8 (79) |
| Nulliparous | 25.6 (118) | 21.9 (93) | 24.5 (165) | 20.4 (126) |
| Prior breast cancer | 5.6 (26) | 3.3 (14) | 5.4 (36) | 4.8 (30) |
| Family history of breast cancer | 24.3 (112) | 15.8 (67) | 25.6 (172) | 15.5 (95) |
| Occupational exposure to PCE | 16.3 (75) | 16.0 (68) | 15.5 (104) | 14.8 (91) |
| RDD Exposure (for no latency) | ||||
| Minimum | --- | 0.001 | --- | 0.001 |
| Maximum | --- | 206.9 | --- | 243.8 |
| Median | --- | 2.9 | --- | 2.5 |
| 75th percentile | --- | 11.9 | --- | 12.1 |
| 90th percentile | --- | 31.0 | --- | 29.2 |