Table 1 Characteristics of the 279 study participants

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)