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Table 3 Estimated differencesa (95% confidence interval) in square-root-transformed percent mammographic density by distance to roadways.

From: Residential particulate matter and distance to roadways in relation to mammographic density: results from the Nurses’ Health Studies

  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  
  1. aAdjusted for cohort, age at mammogram, body mass index at mammogram, parity and age at first birth categories, hormonal therapy use, history of biopsy-confirmed benign breast disease, and date of mammogram