Table 1.

Overview of the KTB breast and peripheral blood methylation dataset

	Age < 50 years	Age ≥ 50 years	Overall
Participants (n)	24	16	40
Age at first donation (mean, SD)	33.8 (8.8)	55.4 (4.3)	42.5 (12.9)
Years between first and second donation (mean, range)	3.9 (2–7)	4.7 (3–6)	4.2 (2–7)
Nulliparous (n)	12	5	17
No.of live births (mean, SD)	0.92 (1.0)	2.0 (1.4)	1.2 (1.2)
No. of pregnancies (mean, SD)	1.0 (1.3)	2.1 (1.5)	1.5 (1.5)
Pre-menopausal (n)	20	2	22
Total menstrual years (mean, range)	20.2 (5–37)	32.6 (13–41)	25.3 (5–41)
Age at menopause (mean, SD)	33.0 (7.2)	45.1 (6.3)	42.5 (8.0)

Participant characteristics for baseline demographic and reproductive variables