Table 2.
Mean/median levels and percentage deficiency for folate, ferritin, iron and vitamin B12 status in early pregnancy, according to category of pre-pregnancy BMI, among women with singleton pregnancies without diabetes (n 4243), the Amsterdam Born Children and their Development (ABCD) study, the Netherlands, 2003–2004
| Nutrient | All | Underweight | Normal weight | Overweight | Obese |
|---|---|---|---|---|---|
| Folate (nmol/l) | |||||
| n | 3807 | 178 | 2802 | 626 | 201 |
| Mean | 24·1 | 24·0 | 25·0 | 21·7 | 19·3 |
| sd | 11·7 | 12·2 | 11·7 | 11·2 | 10·7 |
| % deficient | 8·8 | 9·3 | 7·0 | 13·1 | 21·8 |
| Ferritin (μg/l) | |||||
| n | 4181 | 193 | 3109 | 670 | 209 |
| Median† | 41·7 | 34·8 | 42·6 | 38·1 | 43·1 |
| IQR† | 24·9–67·4 | 23·0–60·4 | 25·7–68·9 | 23·0–61·7 | 23·0–76·0 |
| % deficient | 10·6 | 13·0 | 9·6 | 13·0 | 14·4 |
| Fe (μmol/l) | |||||
| n | 4003 | 186 | 2980 | 638 | 199 |
| Mean | 22·0 | 21·9 | 22·7 | 19·9 | 17·6 |
| sd | 7·3 | 8·0 | 7·2 | 6·7 | 6·9 |
| % deficient | 6·1 | 8·6 | 4·6 | 8·6 | 19·6 |
| Vitamin B12 (pg/ml) | |||||
| n | 4112 | 189 | 3062 | 655 | 206 |
| Median† | 297·2 | 304·6 | 301·7 | 286·6 | 267·2 |
| IQR† | 235·1–377·9 | 226·5–383·7 | 240·1–381·5 | 222·9–3712 | 2137–339·9 |
| % deficient | 13·8 | 16·9 | 12·4 | 16·8 | 22·8 |
IQR, interquartile range.
All values are standardized for gestational age at blood sampling moment (90 d).
†
Median and IQR are given because of skewed distribution of the variable.