Box plots of different biomarker levels in different iron store levels. (A) Ferritin in logarithmic scale, (B) TSAT, (C) sTfR, (D) transferrin, (E) hemoglobin, and (F) MCV. The box plots are grouped by bone marrow iron storage in females (blue) and males (red). Inside boxes, thick lines are medians; notches around them are 95% CI. The box is interquartile range (IQR). The whiskers equal minimum or maximum up to 1.5 times IQR. Outliers (>1.5 times IQR from edges of box) are marked as dots.