Table 1 Comparison of patients’ baseline characteristics between the three year groups

Sex—no. (%)

Male

3 (0.4)

18 (1.0)

19 (0.6)

0.18

Female

685 (99.6)

1853 (99.0)

3001 (99.3)

Education—no. (%)

Illiterate

48 (24.9)^a

117 (18.0)^b

306 (16.2)^b

0.01

Primary school

53 (27.5)^a

203 (31.3)^a

529 (28.0)^a

High school

65 (33.7)^a

201 (31.0)^a

647 (34.2)^a

Collage education

27 (14.0)^a

128 (22.7)^{a, b}

408 (21.6)^b

Job—no. (%)

Retired

40 (19.2)^a

107 (14.6)^a

185 (8.3)^b

0.01

Stay at home

157 (75.5)^a

563 (76.9)^a

1811 (81.1)^b

Governmental employee

11 (5.3)^a

62 (8.5)^{a, b}

237 (10.6)^b

Marital status—no. (%)

Divorced

7 (3.3)^a

15 (2.0)^a

38 (1.7)^a

0.01

Married

156 (73.9)^a

587 (79.3)^{a, b}

1840 (79.9)^b

Single

48 (22.8)^a

138 (18.7)^b

414 (18.4)^b

BMI—kg/m²

28.06 ± 4.99

27.60 ± 4.52

27.92 ± 4.90

0.225

Age of start menstruation—yrs

13.28 ± 1.41

13.39 ± 1.92

13.26 ± 1.94

0.250

Age of first pregnancy—yrs

20.79 ± 5.46

21.50 ± 6.83

21.63 ± 7.52

0.290

No. of abortions

1.52 ± 0.86

1.51 ± 0.88

1.57 ± 1.03

0.669

No. of children

4.02 ± 1.99^a

3.55 ± 1.77^b

3.36 ± 1.88^b

<0.001

Duration of breast feeding—wks

68.03 ± 52.11^a

59.12 ± 42.01^b

57.55 ± 41.93^b

0.006

Age of menopause—yrs

47.31 ± 4.73

47.76 ± 6.10

48.06 ± 5.41

0.208

Use of OCP—no. (%)

Yes

127 (60.2)^a

406 (55.1)^{a, b}

1189 (51.8)^b

0.031

No

84 (39.8)^a

331 (44.9)^{a, b}

1105 (48.2)^b

Use of HRT—no. (%)

Yes

4 (1.9)

9 (1.3)

36 (1.6)

0.72

No

204 (98.1)

708 (98.7)

2212 (98.4)

Cigarette use—no. (%)

Yes

1 (0.5)

4 (0.5)

26 (1.1)

0.278

No

207 (99.5)

739 (99.5)

2290 (98.9)

Waterpipe use—no. (%)

Yes

19 (9.1)

58 (7.8)

213 (9.2)

0.492

No

190 (90.9)

684 (92.2)

2091 (90.8)

Use of alcohol—no. (%)

Yes

0

1 (0.1)

3 (0.1)

0.872

No

207 (100)

739 (99.9)

2302 (99.9)

Physical activity—no. (%)

Yes

64 (30.8)^a

310 (41.9)^b

932 (40.3)^b

0.01

No

144 (69.2)^a

430 (58.1)^b

1379 (59.7)^b