| Estrogen receptor (ER) tumor status | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
ER negative | ER positive | Â | Unknown | ||||||||
Controls | Cases | ORa | 95% CI | Cases | ORa | 95% CI | Pb | Cases | ORa | 95% CI | |
Chest X-ray exposure | |||||||||||
 No | 239 | 32 | 1 |  | 107 | 1 |  |  | 69 | 1 |  |
 Yes | 1104 | 132 | 1.50 | 0.94–2.39 | 692 | 2.13 | 1.56–2.91 | 0.16 | 480 | 2.21 | 1.51–3.24 |
Number of exposures | |||||||||||
 0 | 239 | 32 | 1 |  | 107 | 1 |  |  | 69 | 1 |  |
 1–3 | 390 | 43 | 1.31 | 0.77–2.25 | 207 | 1.73 | 1.22–2.46 | 0.67 | 142 | 1.87 | 1.21–2.87 |
 4–9 | 200 | 29 | 1.99 | 1.10–3.62 | 140 | 2.65 | 1.80–3.92 |  | 82 | 2.51 | 1.55–4.07 |
 ≥10 | 215 | 21 | 1.51 | 0.79–2.90 | 124 | 2.23 | 1.49–3.33 |  | 118 | 3.27 | 2.03–5.28 |
 Continuous |  |  | 1.01 | 0.99–1.04 |  | 1.02 | 1.00–1.03 | 0.58 |  | 1.03 | 1.01–1.05 |
Age at first exposure, yearsc | |||||||||||
 No exposure | 239 | 32 | 0.70 | 0.41–1.19 | 107 | 0.53 | 0.38–0.75 |  | 69 | 0.53 | 0.35–0.81 |
 ≥20 | 490 | 52 | 1 |  | 263 | 1 |  |  | 170 | 1 |  |
 15–19 | 222 | 33 | 1.06 | 0.64–1.78 | 154 | 1.07 | 0.78–1.47 | 0.66 | 101 | 0.86 | 0.58–1.27 |
 <15 | 219 | 27 | 1.13 | 0.66–1.94 | 139 | 1.04 | 0.75–1.44 |  | 124 | 1.25 | 0.86–1.82 |
 Continuous |  |  | 1.01 | 0.99–1.03 |  | 1.01 | 0.99–1.02 | 0.39 |  | 1.00 | 0.99–1.01 |
According to first full-term pregnancy (FFTP)c | |||||||||||
 Only after FFTPd | 232 | 35 | 1 |  | 141 | 1 |  |  | 92 | 1 |  |
 Before (incl. no FTP) | 725 | 79 | 0.66 | 0.41–1.07 | 435 | 0.83 | 0.61–1.13 | 0.22 | 311 | 0.84 | 0.58–1.22 |