Characteristic | Breast cancer cases | Controls | ||
---|---|---|---|---|
Operator | n = 62 | n = 176 | P | |
Average counts in fibroglandular tissue, mean ± SD (range) | 1 | 41.5 ± 20.7 (6.8–116.6) | 37.6 ± 23.2 (7.3–218.4) | 0.08 |
2 | 41.2 ± 21.1 (7.2–194.9) | 36.5 ± 21.7 (6.5–114.6) | 0.08 | |
Average counts in fat, mean ± SD (range) | 1 | 31.5 ± 14.3 (5.9–87.4) | 32.7 ± 17.2 (6.2–95.7) | 0.99 |
2 | 32.6 ± 16.0 (5.7–90.7) | 32.5 ± 17.0 (7.2–98.9) | 0.78 | |
Quantitative BPU (fibroglandular/fat), mean ± SD (range) | 1 | 1.4 ± 0.4 (0.8, 2.8) | 1.2 ± 0.3 (0.4, 2.9) | 0.002 |
2 | 1.4 ± 0.5 (0.8, 2.9) | 1.2 ± 0.4 (0.5, 3.2) | 0.007 |