Table 1 Descriptive characteristics of the participants

Education

Elementary

33 (11.6)

40 (14.0)

0.310^*

Middle school

42 (14.7)

54 (18.9)

Diploma

112 (39.3)

95 (33.3)

University

98 (34.4)

96 (33.7)

Employment status

Employed

53 (18.6)

57 (20.0)

0.880^*

Not employed

232 (81.4)

228 (80.0)

Marital status

Married

230 (80.7)

240 (84.2)

0.413^*

Single

37 (13.0)

26 (9.1)

Widow or divorced

18 (5.4)

19 (6.7)

Gravida

0

13 (5.2)

18 (6.9)

0.011^*

1

52 (21.0)

35 (13.5)

2

93 (37.5)

90 (34.7)

3≤

90 (36.3)

116 (44.8)

Number of abortions

0

165 (66.5)

170 (65.6)

0.854^*

1

59 (23.8)

60 (23.2)

2≤

24 (9.7)

29 (11.2)

History of breastfeeding

Yes

223 (78.2)

229 (80.4)

0.535^*

No

62 (21.8)

56 (19.6)

Number of times breastfeed

1

79 (35.4)

52 (22.7)

0.001^*

2

108 (48.4)

109 (47.6)

3

29 (13.0)

57 (24.9)

4≤

7 (3.1)

11(4.8)

History of infertility

Yes

26 (9.1)

15 (5.3)

0.750^*

No

259 (90.9)

270 (94.7)

History of infertility treatment

Yes

26 (9.1)

13 (4.6)

0.031^*

No

259 (90.9)

272 (95.4)

Contraception method

Hormonal

62 (21.8)

59 (20.7)

0.390^*

Withdrawal

105 (36.8)

122 (42.8)

Non-hormonal

54 (19.0)

57 (20.0)

No method

64 (22.5)

47 (16.5)

Family history of breast cancer

Yes

63 (22. 1)

54 (18.9)

0.351^*

No

222 (77.9)

231 (81.1)

History of PCOS

Yes

36 (12.6)

12 (4.2)

< 0.001^*

No

249 (87.4)

273 (95.8)

Mean ± SD

Mean ± SD

Age of the menarche (years)

13.09 ± 1.47

13.33 ± 1.52

0.058^**

Age at the first pregnancy (years)

23.53 ± 5.37

22.99 ± 4.77

0.247^**

Age at the first breastfeeding (years)

23. 93 ± 5.49

23.34 ± 4.72

0.216^**

Total duration of breastfeeding (months)

36.60 ± 20.56

39.93 ± 19.71

0.079^**

Total duration of infertility (years)

8.88 ± 7.30

10.26 ± 7.63

0.569**