# Table 2 Multivariate adjusted*mean (95%CI) of percent (%) mammographic density by duration of physical activity (mins/week) for all women and stratified by BMI

VARIABLES

ALL

In strata of BMI

Â Â

< 25

â‰¥ 25-29

â‰¥ 30

Â

Nâ€‰=â€‰2218

Nâ€‰=â€‰1235

Nâ€‰=â€‰732

Nâ€‰=â€‰251

Physical_activity (mins/week)

Â Â Â Â Â Â Â Â

No activity

140

15.6 (14.0- 17.3)

58

21.8 (19.4- 24.2)

46

15.9 (13.6- 18.2)

36

8.4 (5.9- 10.9)

30- 45

129

16.2 (14.6- 17.7)

59

22.2 (20.3- 24.0)

46

15.2 (13.5- 17.0)

24

8.1 (6.3- 10.0)

46-100

280

16.7 (15.8- 17.5)

138

22.5 (21.7- 23.9)

108

14.6 (13.3- 15.8)

34

7.9 (6.5- 9.3)

101-180

408

17.8 (17.1- 18.5)

215

23.0 (22.0- 23.8)

134

13.9 (13.0- 14.8)

59

7.7 (6.5- 9.0)

181-360

630

18.5 (18.0- 19.0)

353

23.2 (22.2- 24.1)

221

13.2 (12.2- 14.3)

56

7.5 (6.0- 9.0)

> 360

631

19.9 (19.4- 20.4)

412

23.6 (22.4- 24.8)

177

12.6 (11.2- 14.0)

42

7.3 (5.2- 9.4)

p for trend

Â

0.65

Â

0.25

Â

0.04

Â

0.60

1. * Least square means and p values for trend from linear regression. Adjusted for age at mammography (continuous), years of education (â‰¤ 11, 12â€“14, 15+), number of pregnancies (nulliparous, 1,2,3,4, 5â€“10), age at first full-term pregnancy for parous women (<20, 20â€“24, 25â€“29, 30+), postmenopausal hormone therapy (never, past, current), body mass index (continuous).