TABLE 3.
Ferritin and hemoglobin concentrations in IPD datasets including pregnant individuals1.
| Karakochuk et al. 2015 [12] (n = 30) | Mlewa et al. 2025 [25] (n = 90) | Wieringa et al. 2016 [28] (n = 7) | |
|---|---|---|---|
| Unadjusted ferritin (μg/L) | 71.9 [25.7, 100.7] | 35.5 [16.7, 65.9] | 70.6 [41.6, 123.8] |
| ID, <15 μg/L | 3 (10) | 22 (24) | 0 (0) |
| Probable ID, <30 μg/L | 9 (30) | 39 (43) | 1 (14) |
| Hemoglobin, measured with an automated analyzer (g/L) | 111.7 ± 10.23 | 107.7 ± 10.23 | — |
| Anemia2 | 13 (43)3 | 44 (49)3 | — |
| Hemoglobin, measured with a HemoCue (g/L) | 107.9 ± 12.74 | — | 111.1 ± 18.74 |
| Anemia2 | 17 (57)4 | — | 4 (57)4 |
Abbreviations: ID, iron deficiency; IPD, individual participant data.
1
Total n = 127 individuals from 3 datasets; n = 120 with eligible data for inclusion in IPD meta-analysis. Values are median [IQR], mean ± SD, or n (%).
2
Based on the WHO trimester-specific thresholds for hemoglobin [38]: <110 g/L for first and third trimesters; <105 g/L for the second trimester. Trimester data were not available for Karakochuk 2015 and Wieringa et al. 2016 [28] datasets; a hemoglobin concentration <110 g/L was used to define anemia in pregnancy in these 2 datasets.
3
Blood source was venous.
4
Blood source was capillary.