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Table 3 Multivariate adjusted * mean (95%CI) of percent (%) mammographic density by light, moderate, strenuous physical activity (mins/week) for all women and stratified by BMI

From: Physical activity and mammographic density in a cohort of postmenopausal Norwegian women; a cross-sectional study

VARIABLES

ALL

In strata of BMI

  

< 25

≥ 25-29

≥ 30

 

N = 2218

N = 1235

N = 732

N = 251

Light_activity (mins/week)

No activity

361

17.3 (16.4- 18.1)

189

23.4 (22.5- 24.3)

111

13.1 (12.3- 14.0)

61

8.4 (7.8- 9.0)

≤ 45**

384

17.7 (16.9- 18.4)

188

22.6 (21.8- 23.4)

143

13.8 (13.0- 14.7)

53

8.1 (7.5- 8.6)

46-100

507

18.4 (17.8- 19.0)

276

23.2 (22.5- 24.0)

175

13.8 (13.0- 14.5)

56

8.0 (7.4- 8.7)

101-180

450

18.2 (17.6- 18.9)

250

22.8 (22.0- 23.6)

156

13.6 (12.9- 14.3)

44

7.0 (6.2- 7.9)

>180

516

19.2 (18.1- 19.7)

332

23.2 (22.6- 23.9)

147

14.3 (13.6- 14.6)

37

7.0 (6.0- 8.2)

p for trend

 

0.45

 

0.79

 

0.54

 

0.27

Moderate_activity (mins/week)

No activity

664

17.2 (16.7- 17.8)

341

21.4 (20.7- 22.0)

236

14.6 (13.9- 15.2)

87

8.5 (7.9- 9.0)

≤ 30

257

17.8 (16.9- 18.6)

130

22.1 (21.2- 23.1)

91

15.0 (14.1- 16.0)

36

8.5 (7.7- 9.2)

31- 45

457

18.3 (17.5- 19.0)

258

23.4 (22.6- 24.1)

142

13.3 (12.6- 14.1)

57

7.3 (6.7- 8.0)

46-100

414

18.6 (17.8- 19.4)

231

24.2 (23.4- 25.0)

138

13.0 (12.3- 13.8)

45

6.8 (6.0- 7.7)

101-180

426

19.8 (19.2- 20.4)

275

24.5 (23.8- 25.3)

125

12.2 (11.4- 13.0)

26

7.0 (6.2- 7.7)

p for trend

 

0.94

 

0.11

 

0.02

 

0.23

Strenuous_activity (mins/week)

No activity

1404

17.4 (17.0- 17.8)

727

22.3 (21.8-22.7)

490

14.0 (13.5- 14.4)

187

7.5 (7.2- 7.9)

≤ 30

218

18.2 (17.2- 19.1)

118

22.6 (21.5-23.7)

72

13.7 (12.7- 14.8)

28

7.5 (6.7- 8.2)

31- 45

265

19.9 (19.0- 20.9)

174

24.5 (23.6- 25.4)

69

13.2 (12.2-14.2)

22

8.4 (6.9- 9.9)

46- 100

197

20.2 (19.3- 21.1)

119

24.9 (23.8- 26.0)

69

12.6 (11.5- 13.7)

9

9.6 (6.6- 12.6)

101-180

134

21.5 (20.5- 22.4)

97

25.2 (24.0- 26.3)

32

12.7 (11.0- 14.4)

5

10.9 (6.6- 15.3)

p for trend

 

0.80

 

0.83

 

0.06

 

0.37

  1. * Least square means and p values for trend from multiple linear regression modeling light, moderate and strenuous activity simultaneously. Adjusted for age at mammography (continuous), years of education (≤ 11, 12–14, 15+), number of pregnancies (nulliparous, 1,2,3,4, 5–10), age at first full-term pregnancy for parous women (<20, 20–24, 25–29, 30+), postmenopausal hormone therapy (never, past, current), body mass index (continuous).
  2. ** Women with ≤ 30 mins of light activity are included in the no activity group.
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