Variables

N

OR

95%CI

p

Age, years

<25

69

1

25 - 30

88

0.78

0.32 - 1.89

0.579

30 - 35

57

2.81

1.16 - 6.81

0.023

≥35

36

0.08

0.25 - 2.58

0.708

Blood groups

A

71

1

AB

7

0.39

0.04 - 4.33

0.446

B

55

0.50

0.20 - 1.25

0.138

O

117

3.57

1.61 - 7.69

0.002

Gestational age

1^st trimester

67

1

2^nd trimester

102

2.20

0.88 - 5.48

0.024

3^rd trimester

81

1.90

0.73 - 4.92

0.186

Abortions

0

199

1

1 - 3

42

4.7

1.40 - 16.67

0.012

≥3

9

NA