Table 1.
Background characteristics by iron group
| Iron-deficient | Iron-sufficient | |
|---|---|---|
| Iron group | anemic | |
| (IDA) | (IS) | |
| N | 4 | 5 |
| Infant | ||
| Gender, % male (n) | 75 (3) | 40 (2) |
| Birth weight, kilograms | 3.4 ± 0.4 | 3.2 ± 0.4 |
| Gestational age, weeks | 40.0 ± 0.8 | 39.4 ± 1.1 |
| Age at testing, months* | 9.7 ± 0.4 | 10.3 ± 0.3 |
| Hemoglobin, g/L* | 104.3 ± 3.4 | 124.6 ± 4.2 |
| Mean corpuscular volume, fl * | 71.0 ± 6.1 | 78.8 ± 2.8 |
| Red cell distribution width, % | 14.2 ± 0.9 | 13.6 ± 0.4 |
| Zinc protoporphyrin/heme ratio, µmol/mol heme | 78.8 ± 16.6 | 64.6 ± 3.4 |
| Transferrin saturation, % | 19.4 ± 10.7 | 25.4 ± 2.1 |
| Ferritin, µg/L | 5.9 ± 6.1 | 21.8 ± 12.1 |
| Lead, µg/dL | 1.3 ± 0.5 | 2.4 ± 0.9 |
| Peabody fine motor standard score | 19.8 ± 2.9 | 22.0 ± 3.3 |
| Peabody gross motor standard score | 28.5 ± 3.8 | 29.8 ± 1.9 |
| Peabody total standard score | 48.3 ± 6.5 | 51.8 ± 4.3 |
| Number of Optotrak trials | 5.8 ± 3.4 | 5.6 ± 1.1 |
| Mother Age at delivery, years | 21.7 ± 2.9 | 21.4 ± 4.0 |
| Education, years | 12.5 ± 0.6 | 12.1 ± 0.2 |
| Medicaid, % (n) | 75 (3) | 60 (3) |
Note. Values are means ± SD or % (n) for categorical variables. N varies slightly due to occasional missing data for some measures. Significant group differences (p < .05) are indicated by an asterisk.