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| Number of studies | Participants | Mean difference (µg/L) | 95% confidence interval | z‐score | P value | |
| Type of iron deficiency | ||||||
| Functional iron deficiency | 3 | 271 | 269.06 | 265.10 to 273.02 | 133.18 | 0.02 |
| Absolute iron deficiency | 3 | 87 | 7.62 | 3.15 to 18.39 | 1.61 |
