Variable | Maternal age (mean ± SD) | Mann-Whitney test | P value |
Taking folic acid |
|
|
|
Yes | 38.18 ± 2.62 | 3.03 | 0.041 |
No | 36.33 ± 1.11 |
|
|
Taking vitamin supplements |
|
|
|
Yes | 38.18 ± 2.62 | 0.89 | 0.372 |
No | 37.13 ± 2.03 |
|
|
Smoking status |
|
|
|
Smoker | 35.5 ± 0.7 | 1.5 | 0.152 |
Nonsmoker | 38.15 ± 2.68 |
|
|
Medications during current pregnancy |
|
|
|
Yes | 37.92 ± 2.59 | 5 | 0.616 |
No | 38.18 ± 2.78 |
|
|
Postdate pregnancy (>40 weeks) |
|
|
|
Yes | 37.61 ± 2.34 | 2 | 0.556 |
No | 38.24 ± 2.74 |
|
|
Missing data | 38.08 ± 2.73 |
|
|