Table 1.

Characteristics of the 279 study participants

Characteristic		All
Sample size	N (%)	279 (100)
Age at mammography	Years ± std	57.6 ± 8.7
Mammographic density	Percent ± std	39.0 ± 22.6
Body mass index (%)	< 25 kg/m2	167 (60)
	25- < 30 kg/m2	81 (29)
	30+ kg/m2	31 (11)
Menopausal status (%)	Premenopausal	76 (27)
	Postmenopausal	203 (73)
Number of children (%)	0–1	92 (33)
	2–3	134 (48)
	> 3	53 (19)
Hormone use (%)	Never	102 (37)
	Estrogen only	97 (35)
	Estrogen and progesterone	80 (29)
Tumor stage (%)	In situ	61 (22)
	Localized	169 (61)
	Regional	37 (13)
	Distant	12 (4)