Figure 1.
Flowchart of the selection of a healthy sample of pregnant women (15-49 years) participating in the NHANES 1999 to 2010 and 2015 to 2018. Pregnant women with an SF >150 μg/L were excluded from the healthy sample because of an increased risk of iron overload.15 Total and by each trimester (first, second, third, and unknown)
