Table 3 Estimated differencesa (95% confidence interval) in square-root-transformed percent mammographic density by distance to roadways.
n | Premenopausal | p for region interaction term | n | Postmenopausal | p for region interaction term | |
|---|---|---|---|---|---|---|
Distance to A1 roads | ||||||
≥ 200 meters | 1576 | Referent | 0.95 | 1598 | Referent | 0.001 |
< 200 meters | 47 | –0.25 (–0.65, 0.15) | 36 | 0.10 (–0.39, 0.60) | ||
p value | 0.22 | 0.68 | ||||
Distance to A1–A2 roads | 0.90 | 0.48 | ||||
≥ 200 meters | 1500 | Referent | 1510 | Referent | ||
50–199 meters | 87 | –0.13 (–0.43, 0.16) | 84 | –0.03 (–0.35, 0.30) | ||
< 50 meters | 36 | 0.06 (–0.39, 0.51) | 40 | –0.12 (–0.59, 0.35) | ||
p trend | 0.65 | 0.88 | ||||
Distance to A1–A3 roads | 0.43 | 0.47 | ||||
≥ 200 meters | 978 | Referent | 936 | Referent | ||
50–199 meters | 413 | –0.05 (–0.21, 0.11) | 431 | –0.16 (–0.33, 0.01) | ||
< 50 meters | 232 | 0.03 (–0.17, 0.23) | 267 | –0.11 (–0.31, 0.10) | ||
p trend | 0.73 | 0.17 | ||||