Variable

No.

%

Age (years ± SD)

38.13 ± 2.68

Nationality

Missing data

1

0.5

Saudi

159

79.9

Non-Saudi

39

19.6

Taking folic acid?

Missing data

128

64.3

Yes

62

31.2

No

9

4.5

Taking vitamin supplements?

Missing data

54

27.2

Yes

137

68.8

No

8

4

Smoking status

Missing data

1

0.5

Smoker

2

1

Nonsmoker

196

98.5

US for dating and viability done?

Missing data

45

22.6

Yes

141

70.9

No

13

6.5

US for nuchal translucency done?

Missing data

191

96

Yes

3

1.5

No

5

2.5

US anatomy scan done?

Missing data

149

74.9

Yes

31

15.6

No

19

9.5

Growth scan in 2nd trimester done?

Missing data

77

38.7

Yes

93

46.7

No

29

14.6

Growth scan in the 3ed trimester done?

Missing data

79

39.7

Yes

83

41.7

No

37

18.6

Taking medications during current pregnancy?

Missing data

21

10.6

Yes

128

64.3

No

5

25.1