From: Environmental radon exposure and breast cancer risk in the Nurses’ Health Study II
Invasive breast cancer | ER+/PR+ | ER−/PR- | |||||||
---|---|---|---|---|---|---|---|---|---|
Stratification variablea | Cases/p-years | HR (95% CI)b | p int. | Cases/p-years | HR (95% CI)b | p int. | Cases/p-years | HR (95% CI)b | p int. |
Region of residence | 0.0002 | 0.13 | 0.45 | ||||||
Northeast | |||||||||
Radon tertile 1 | 198/110,392 | Referent | 94/110,506 | Referent | 22/110,559 | Referent | |||
Radon tertile 2 | 665/376,841 | 1.05 (0.90, 1.23) | 356/377,134 | 1.19 (0.95, 1.50) | 72/377,377 | 0.96 (0.60, 1.56) | |||
Radon tertile 3 | 494/341,830 | 0.83 (0.70, 0.99) | 262/342,049 | 0.96 (0.76, 1.23) | 69/342,242 | 0.91 (0.56, 1.49) | |||
Midwest | |||||||||
Radon tertile 1 | 158/105,523 | Referent | 87/105,584 | Referent | 14/105,661 | Referent | |||
Radon tertile 2 | 441/311,230 | 0.96 (0.80, 1.15) | 241/311,433 | 0.95 (0.74, 1.21) | 73/311,597 | 1.77 (1.00, 3.14) | |||
Radon tertile 3 | 616/391,334 | 1.09 (0.91, 1.29) | 301/391,619 | 0.96 (0.76, 1.22) | 96/391,793 | 1.86 (1.06, 3.26) | |||
West | |||||||||
Radon tertile 1 | 504/308,674 | Referent | 279/308,883 | Referent | 62/309,064 | Referent | |||
Radon tertile 2 | 94/48,620 | 1.19 (0.95, 1.49) | 59/48,653 | 1.41 (1.06, 1.89) | 8/48,713 | 0.72 (0.34, 1.53) | |||
Radon tertile 3 | 53/20,194 | 1.47 (1.10, 1.97) | 23/20,223 | 1.22 (0.80, 1.88) | 7/20,239 | 1.52 (0.69, 3.37) | |||
South | |||||||||
Radon tertile 1 | 464/300,872 | Referent | 224/301,096 | Referent | 50/301,245 | Referent | |||
Radon tertile 2 | 158/102,885 | 0.95 (0.79, 1.14) | 76/102,968 | 0.95 (0.73, 1.23) | 23/103,014 | 1.27 (0.77, 2.10) | |||
Radon tertile 3 | 110/77,355 | 0.91 (0.74, 1.13) | 64/77,389 | 1.11 (0.84, 1.47) | 17/77,433 | 1.26 (0.72, 2.19) |