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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

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
Physical_activity (mins/week)         
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   0.65   0.25   0.04   0.60
  1. * Least square means and p values for trend from linear regression. 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).