Table 1 Baseline characteristics and reproductive history in different tertiles of endogenous estrogen exposure.^** 

EEE, years

14.4 (3.1)^Ɨ

25.3 (3.07)•

35.1 (5.4)*

24.9 (9.3)

 < 0.001

Age, years

65.6 (8.2)^Ɨ

60.8 (6.7) •

64.6 (7.7)

63.7 (7.8)

 < 0.001

Educational level (≥ 12 years), n (%)

21 (6.6%)

27 (8.6%)•

52 (15.8%)*

100(10.1%)

 < 0.001

Calorie intake, kcal

1820 (649)

1903 (608)

1849 (562)

1858 (607)

0.312

Physical activity (Low), n (%)

163 (50%)

191(59.7%)

177(57.1%)

531(56%)

0.183

Smoking (yes), n (%)

7 (2.2%)

10 (3.1)

9 (2.6%)

26 (2.6%)

0.788

Menarcheal age, years

12.8 (1.6)

12.9 (1.5) •

12.6 (1.5)

12.8 (1.5)

0.049

Menopausal age, years

48.1 (6.1)

47.9 (4.3) •

51.3 (3.8)*

49.1 (5.1)

 < 0.001

Duration of pregnancies, weeks

162 (67) ^Ɨ

141 (58)

144 (63)*

149 (63)

 < 0.001

Duration of breastfeeding, weeks

26 (16–54)

32 (16–58) •

16 (4–24)*

20 (12–48)

 < 0.001

Duration of hormonal contraceptive use, weeks

0 (0–24)

0 (0–12) •

0 (0–1)*

0 (0–6)

 < 0.001

Duration after menopause, years

17 (11–22) ^Ɨ

12 (7–17)

11 (7–18)*

13 (8–20)

 < 0.001