Extended Data Fig. 2: A meta-analysis of the effect of sickle cell trait on iron deficiency anemia (IDA).
From: Malaria is a cause of iron deficiency in African children

Overall represents a fixed-effect meta-analysis of cohort-specific odds ratios. Error bars indicate 95% confidence intervals. n shows the number of individuals included in the analysis. Numbers for IDA are fewer compared to those for ID since not all children had hemoglobin concentrations measured.