Table 2.
Pre- and post-menopausal breast measures and changes in breast measures over menopause (n = 591)
| Median (IQR) | |||
|---|---|---|---|
| Premenopause at baseline | Postmenopause at follow-up | Median change over menopausea | |
| Breast density, % | 44.6 (27.6; 59.1) | 33.6 (16.5; 52.4) | −6.8 (−15.6; 0.5) |
| Dense area, cm2 | 42.7 (30.4; 57.5) | 26.8 (14.5; 37.3) | −12.4 (−25.1; −4.1) |
| Nondense area, cm2 | 57.3 (36.0; 88.5) | 65.4 (34.0; 94.2) | 0.3 (−13.2; 14.8) |
| Breast area, cm2 | 105.3 (84.2; 133.7) | 94.6 (68.0; 120.1) | −9.6 (−26.1; 2.1) |
| Weightb, kg | 67.0 (61.0; 73.0) | 68.0 (62.0; 75.0) | 1.0 (−1.0; 3.5) |
IQR interquartile range
aMedian change over menopause is determined by subtracting the pre- from the post-menopausal measures for each woman and then determining the median
bInformation about postmenopausal weight is acquired from the follow-up questionnaire (self-reported). Weight change is the change in weight between the weight reported in the follow-up questionnaire and at baseline