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 | ||||||
|---|---|---|---|---|---|---|---|---|
| < 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 | ||||
* 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).