Fig. 2From: The association of body mass index and weight waist adjustment index with serum ferritin in a national study of US adultsThe association between WWI and serum ferritin (ng/ml). a Each black point represents a sample. b Solid rad line represents the smooth curve fit between variables. Blue bands represent the 95% of confidence interval from the fit. *All covariates in Additional file 3: Table S5 were adjustedBack to article page