TABLE 3.
Iron isotope enrichment in maternal and neonatal blood1
| Observed isotope enrichment, % | Total net 57Fe recovered, mg | Net 57Fe recovered, mg/kg | Partitioning, % | |
|---|---|---|---|---|
| All groups | ||||
| Mothers | 3.27 [2.90, 3.89]a; n = 64 | 1.24 [1.21, 1.55]a; n = 66 | 0.02 [0.01, 0.02]; n = 66 | 91.21 [90.12, 92.31]a; n = 61 |
| Infants | 3.66 [3.06, 4.31]b; n = 61 | 0.11 [0.10, 0.13]b; n = 61 | 0.03 [0.03, 0.4]b; n = 61 | 8.12 [7.11, 9.19]b; n = 61 |
| Total | — | 1.50 [1.24, 1.80]c; n = 61 | — | — |
| Peru singletons | ||||
| Mothers | 2.54 [2.13, 2.98]; n = 43 | 0.72 [0.59, 0.87]a; n = 43 | 0.01 [0.01, 0.01]a; n = 43 | 90.01 [88.48, 91.55]b; n = 37 |
| Infants | 2.47 [2.05, 2.92]; n = 37 | 0.07 [0.06, 0.08]b; n = 37 | 0.02 [0.02, 0.03]b; n = 37 | 9.47 [8.10, 10.94]a; n = 37 |
| Total | — | 0.81 [0.66, 0.97]c; n = 37 | — | — |
| Rochester singletons | ||||
| Mothers | 5.21 [4.19, 6.35]a; n = 18 | 2.62 [2.19, 3.08]a; n = 18 | 0.03 [0.03, 0.04]; n = 18 | 94.14 [92.94, 95.35]b; n = 18 |
| Infants | 6.62 [5.21, 8.20]b; n = 19 | 0.17 [0.12, 0.23]b; n = 19 | 0.05 [0.04, 0.07]; n = 19 | 5.62 [4.52, 6.82]a; n = 18 |
| Total | — | 2.78 [2.32, 3.29]c; n = 18 | — | — |
| Rochester multiples | ||||
| Mothers | 4.22 [2.70, 6.08]a; n = 5 | 2.45 [1.20, 4.13]a; n = 5 | 0.03 [0.02, 0.03]a; n = 5 | 90.53 [87.47, 93.64]b; n = 5 |
| Infant unit | 4.94 [4.08, 5.87]b; n = 5 | 0.21 [0.11, 0.34]b; n = 5 | 0.05 [0.03, 0.06]b; n = 5 | 8.32 [3.84, 14.52]a; n = 5 |
| Total | — | 2.55 [1.84, 3.36]c; n = 5 | — | — |
| Rochester singletons with placenta available | ||||
| Mothers | 5.20 [3.93, 6.48]; n = 14 | 2.62 [2.08, 3.16]; n = 14 | 0.03 [0.02, 0.04]; n = 14 | 92.27 [90.61, 93.93]; n = 14 |
| Infants | 6.59 [4.95, 8.23]; n = 14 | 0.18 [0.11, 0.24]; n = 14 | 0.06 [0.04, 0.07]; n = 14 | 5.91 [4.43, 7.38]; n = 14 |
| Placenta | 5.91[4.58, 7.24]; n = 14 | 0.05 [0.03, 0.06]; n = 14 | 0.10 [0.07, 0.12]; n = 14 | 1.82 [1.44, 2.20]; n = 14 |
| Total | — | 2.82 [2.22, 3.42]; n = 14 | — | — |
1
Values are means [95% CIs] unless otherwise indicated. Differences between mothers, infants, and/or placenta were analyzed by ANOVA. Different superscript letters indicate significant differences within cohorts between the mother, neonate, and placenta.