Table 4.
Multivariate adjusted*mean (95%CI) of percent (%) mammographic density by moderate + strenuous physical activity (mins/week) for all women combined and stratified by BMI
| VARIABLES | ALL | In strata of BMI | ||||||
|---|---|---|---|---|---|---|---|---|
| < 25 | ≥ 25-29 | ≥ 30 | ||||||
| N = 2218 | N = 1235 | N = 732 | N = 251 | |||||
| Moderate + strenuous activity (mins/week) | ||||||||
| No activity | 566 | 16.9 (16.3- 17.5) | 287 | 20.9 (20.2- 21.6) | 200 | 14.8 (14.2- 15.5) | 79 | 8.0 (7.5- 8.5) |
| ≤ 30 | 193 | 17.2 (16.1- 18.2) | 90 | 21.9 (20.8- 23.1) | 73 | 14.9 (13.9- 16.0) | 30 | 8.4 (7.6- 9.2) |
| 31- 45 | 265 | 17.2 (16.2- 18.2) | 139 | 22.9 (21.8- 24.0) | 84 | 13.0 (12.0 - 14.1) | 42 | 7.5 (6.7- 8.3) |
| 46- 100 | 435 | 18.5 (17.8- 19.1) | 238 | 23.2 (22.4- 23.9) | 149 | 13.8 (13.1- 14.6) | 48 | 7.3 (6.6- 8.0) |
| 101-180 | 426 | 19.1 (18.4- 19.8) | 254 | 24.0 (23.2- 24.8) | 136 | 12.5 (11.7 -13.3) | 36 | 7.7 (6.8- 8.7) |
| >180 | 333 | 20.6 (20.0- 21.3) | 227 | 25.4 (24.6- 26.1) | 90 | 12.1 ( 11.2- 13.0) | 18 | 7.2 (5.8- 8.6) |
| p for trend | 0.81 | 0.06 | 0.001 | 0.51 | ||||
* 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), light physical activity.