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Table 2 Distribution of selected confounders of breast cancer subjects (%) and RDDs of PCE-exposed controls.

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

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