Fig. 1
From: Lifetime changes in body fatness and breast density in postmenopausal women: the FEDRA study
Function-on-Scalar models estimating, among 390 women from the FEDRA study in the age interval 63–68, the effect (β(t)) of the body mass index (BMI, kg/m2) over a time-varying function of: A the mammographic volumetric percent density; B the breast dense volume; C the breast non-dense volume. In Model 1 the BMI at age 20 was considered. In Model 2, the BMI at age 40 was considered. A positive value of β(t) indicates a positive association between BMI and mammographic density measures and vice versa. All the models were adjusted for menopausal status, age at menarche and birth index. The 95% confidence intervals were obtained through 500 bootstrap sampling