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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.