Figure 1

Serum concentration of Fibroblast Growth Factor 21 (FGF21) in a group of 179 healthy, non-obese children (114 girls, 65 boys). Each square represents the FGF21-serum concentration in a child. In 16 boys and 22 girls the FGF21-concentration was below the lowest standard of the assay; these values were set at 15 pg/mL. The solid vertical lines indicate the median values of serum-FGF21 in girls and boys, respectively. The dotted lines indicate the lowest standard of the assay. Note that the Y-axis is logarithmic.