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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