Table 4.

Percentage and absolute mammographic density by morning MT6s levels

	Morning MT6s^b
	Q1 (n = 160)	Q2 (n = 160)	Q3 (n = 160)	Q4 (n = 160)	P
Percent mammographic density [adjusted^a mean (95%CI)]	22.6 (20.1–25.1)	23.1 (20.7–25.6)	23.2 (20.8–25.5)	23.4 (21.0–25.9)	0.65
Absolute density [adjusted^a mean (95%CI)]	21.8 (18.3–25.2)	22.8 (19.3–26.2)	23.0 (19.6–26.4)	23.9 (20.3–27.4)	0.42

↵^aAdjustment for age, BMI, menopausal status, age at menopause, age at menarche, smoking, and season of the year when mammography was conducted.
↵^bQuartile ranges: Q1, ≤25.04 ng/mgCr; Q2, >25.04 to ≤42.42 ng/mgCr; Q3, >42.42 to ≤67.52 ng/mgCr; and Q4, >67.52 ng/mgCr.