Table 2.

Adjusted means with 95% confidence interval of percent breast density according to the quartile of urinary aMT6-s level

Premenopausal
Postmenopausal
Range*nMean (95% CI)Mean (95% CI)Range*nMean (95% CI)Mean (95% CI)
Q1 (low)<25.64421.1 (15.6-27.5)22.7 (17.6-28.4)<20.23013.2 (8.5-19.0)15.5 (10.7-21.3)
Q225.6-39.14433.9 (27.1-41.6)34.7 (28.5-41.6)20.2-36.03117.6 (12.2-24.1)16.7 (11.7-22.6)
Q339.2-54.24433.1 (26.3-40.6)30.9 (25.0-37.3)36.1-50.63120.9 (15.0-27.7)20.5 (15.1-26.7)
Q4 (high)>54.24336.2 (28.8-44.4)35.7 (29.2-42.9)>503114.7 (9.6-20.9)13.7 (9.1-19.1)
P for trend0.0080.020.580.86
  • Abbreviation: 95% CI, 95% confidence interval.

  • * Range of aMT6-s (ng/mg creatinine).

  • Adjusted for age and mammogram view (MLO/CC).

  • Adjusted for age and mammogram view (MLO/CC), BMI, smoking status, and day length on the day previous to the urine collection.