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Table 1 Study population characteristics according to weight change categories (n = 591)

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

   Weight loss (more than −3.0 %) Stable weight (−3.0 %; +3.0 %) Weight gain (more than +3.0 %)
Number of women, n (%)   109 (18.5) 255 (43.1) 227 (38.4)
Weight change (%), median (IQR)   −5.8 (−8.1; −4.0) 0.0 (−1.5; 1.5) 6.3 (4.5; 10.3)
Weight change (kg), median (IQR)   −4.0 (−6.5; −3.0) 0.0 (−1.0; 1.0) 4.0 (3.0; 6.5)
Weight at baseline (kg), median (IQR)   69.0 (62.5; 82.0) 67.0 (61.5; 73.0) 66.0 (60.0; 71.5)
Age at baseline (years), median (IQR)   51 (50; 53) 51 (50; 53) 50 (50; 52)
BMI at baseline (kg/m2), median (IQR)   26.0 (23.0; 30.0) 25.0 (22.0; 27.0) 24.0 (23.0; 26.0)
BMI at follow-upa (kg/m2), median (IQR)   24.3 (21.8; 27.6) 24.7 (22.3; 26.7) 25.9 (24.2; 28.4)
Waist at baseline (cm), median (IQR)   82.0 (75.0; 92.5) 80.0 (74.0; 86.0) 79.0 (73.0; 84.0)
Age at menarche (years), median (IQR)   13 (13; 14) 13 (12; 14) 13 (13; 14)
Age at menopause (years), median (IQR)   52 (50; 54) 52 (50; 54) 52 (50; 53)
Number of children   2 (2; 3) 2 (2; 3) 2 (2; 3)
Age at first deliveryb ( years), median (IQR)   25 (23; 27) 25 (23; 27) 24 (22; 27)
Time span between pre- and post-menopausal mammogram (years), median (IQR)   5 (4; 6) 5 (4; 6) 5 (4; 6)
Time span between baseline and follow-up questionnaire (years), median (IQR)   4 (3; 5) 4 (3; 4) 4 (3; 5)
Age at first childbirthb, n (%) No children 14 (12.8) 28 (11.0) 30 (13.2)
  ≤20 years 8 (7.3) 14 (5.5) 23 (10.1)
  21–25 years 50 (49.5) 112 (43.9) 97 (42.7)
  26–30 years 30 (27.5) 79 (31.0) 61 (26.9)
  31–35 years 7 (6.4) 18 (7.1) 12 (5.3)
  >35 years 0 (0.0) 4 (1.6) 4 (1.8)
  1. IQR interquartile range, BMI body mass index
  2. aCalculated using body weight at follow-up and height at baseline
  3. bOnly among parous women