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Table 4 Effect modification of the association a between MD and long-term exposure to traffic-related air pollution (NO 2 per 10 μg/m 3 , NO x per 20 μg/m 3 ) by menopause and smoking status, among 4,769 women

From: Long-term exposure to air pollution and mammographic density in the Danish Diet, Cancer and Health cohort

  OR (95% CI) OR (95% CI) p-value
  Premenopausal n =  839 Postmenopausal n  = 3,930
Baseline NOx 0.95 (0.88-1.03) 0.98 (0.94-1.01) 0.62
NOx since 1971 0.92 (0.83-1.03) 0.97 (0.92-1.01) 0.47
Baseline NO2 0.83 (0.67-1.01) 0.94 (0.87-1.02) 0.28
NO2 since 1971 0.77 (0.59-1.01) 0.91 (0.82-1.02) 0.27
  Never smoker n = 1814 Ever smoker n = 2,955  
Baseline NOx 0.96 (0.91-1.01) 0.98 (0.94-1.02) 0.66
NOx since 1971 0.96 (0.89-1.03) 0.97 (0.92-1.02) 0.84
Baseline NO2 0.91 (0.80-1.03) 0.94 (0.85-1.03) 0.70
NO2 since 1971 0.90 (0.75-1.06) 0.90 (0.79-1.02) 0.99
  1. BMI – body mass index; OR – odds ratio; CI – confidence interval; aadjusted for age, BMI, HRT status, HRT duration, number of children; alcohol use, alcohol intake (g/day), physical activity, education level; smoking status.