Table 2 ABC. Mean values with standard deviation (SD) and median values with interquartile range (IQR) for (A) absolute dense volume; (B) breast volume; and (C) percent dense volume on an individual level for women developing and not developing screen-detected or interval breast cancer during three consecutive screening rounds of biennial screening in BreastScreen Norway, 2007–2020
From: Mammographic density by time and breast: a retrospective cohort study from BreastScreen Norway
A. Absolute dense volume (cm3) | Screening round | ||
|---|---|---|---|
First | Second | Third | |
Women developing screen-detected cancer (n = 970) |  | ||
Mean (SD) | 53.0 (25.0) | 52.7 (25.1) | 52.2 (24.8) |
Median (IQR) | 47.3 (35.2–64.3) | 45.9 (35.2–65.7) | 46.6 (35.0–63.0) |
Women developing interval cancer (n = 308) |  | ||
Mean (SD) | 59.6 (33.7) | 59.1 (34.9) | 59.2 (32.9) |
Median (IQR) | 50.1 (37.3–69.0) | 49.1 (35.9–70.2) | 50.7 (38.0–69.8) |
Women developing screen-detected or interval cancer (n = 1278) |  | ||
Mean (SD) | 54.6 (27.5) | 54.2 (27.9) | 53.9 (27.1) |
Median (IQR) | 48.2 (35.6–65.3) | 46.4 (35.2–67.1) | 47.4 (35.7–65.2) |
Women not developing breast cancer (n = 76,904) |  |  | |
Mean (SD) | 47.7 (23.5) | 46.9 (22.9) | 45.8 (22.4) |
Median (IQR) | 42.1 (32.6–56.1) | 41.5 (32.1–55.1) | 40.5 (31.4–53.8) |
B. Breast volume (cm3) | Screening round | ||
| Â | First | Second | Third |
Women developing screen-detected cancer (n = 970) |  | ||
Mean (SD) | 904.8 (457.1) | 919.6 (454.5) | 936.2 (455.6) |
Median (IQR) | 829.5 (577.4–1150.4) | 834.7 (597.3–1160.2) | 857.9 (615.5–1193.2) |
Women developing interval cancer (n = 308) |  | ||
Mean (SD) | 795.0 (417.0) | 815.3 (424.4) | 823.9 (417.5) |
Median (IQR) | 700.9 (476.9–1047.9) | 739.4 (514.5–1026.7) | 745.7 (522.1–1083.3) |
Women developing screen-detected or interval cancer (n = 1278) |  | ||
Mean (SD) | 878.4 (450.0) | 894.5 (449.5) | 909.2 (449.1) |
Median (IQR) | 797.6 (551.4–1125.0) | 814.1 (581.7–1134.7) | 831.2 (587.8–1164.7) |
Women not developing breast cancer (n = 76,904) |  |  | |
Mean (SD) | 879.0 (447.0) | 897.1 (444.9) | 914.2 (447.2) |
Median (IQR) | 809.6 (555.0–1130.2) | 828.8 (577.9–1147.2) | 850.8 (592.0–1166.2) |
C. Percent dense volume (%) | Screening round | ||
| Â | First | Second | Third |
Women developing screen-detected cancer (n = 970) |  |  | |
Mean (SD) | 7.0 (4.0) | 6.7 (3.7) | 6.6 (3.7) |
Median (IQR) | 5.7 (4.2–8.6) | 5.6 (4.2–8.2) | 5.5 (4.0–8.0) |
Women developing interval cancer (n = 308) |  | ||
Mean (SD) | 8.9 (5.1) | 8.5 (4.9) | 8.3 (4.4) |
Median (IQR) | 7.3 (5.3–11.1) | 7.2 (5.0–10.4) | 7.3 (4.9–10.3) |
Women developing screen-detected or interval cancer (n = 1278) |  | ||
Mean (SD) | 7.4 (4.4) | 7.1 (4.1) | 7.0 (4.0) |
Median (IQR) | 6.1 (4.4–9.2) | 5.9 (4.3–8.7) | 5.8 (4.2–8.5) |
Women not developing breast cancer (n = 76,904) |  |  | |
Mean (SD) | 6.6 (4.0) | 6.3 (3.8) | 6.1 (3.9) |
Median (IQR) | 5.3 (3.9–8.0) | 5.1 (3.7–7.6) | 4.8 (3.5–7.4) |