The effect of weight change on changes in breast density measures over menopause in a breast cancer screening cohort.

As the size of the change estimates in the two BMI groups are comparable (for BMI of not more than 25: −4.5 % (95 % CI −8.7; −0.3), −6.8 % (95 % CI −9.7; −3.8), and −9.9 % (95 % CI −12.7; −7.0) and for BMI of more than 25: −5.9 % (95 % CI −10.2; −1.6), −6.1 % (95 % CI −9.6; −2.6), and −10.4 % (95 % CI −12.8; −7.0) for the weight loss, stable weight, and weight gain groups, respectively), the borderline significance in the group with a BMI of more than 25 is probably caused by a lack of power because of the low number of women in this group.

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