Figure 3. Relationship between heavy metal levels and IL-13 in umbilical cord blood. Mixed model was applied to analyze the association of IL-13 with (A) lead (Pb, µg/dl), (B) mercury (Hg, µg/l), (C) chromium (Cr, µg/l), and (D) cadmium (Cd, µg/l). IL-13 levels in cord blood was positively correlated with only lead levels in cord blood (p=0.028).