Fig. 2

The relationship between Hb and IGF-1 SDS by smooth curve fitting (n = 178), P < 0.001. The solid line is the curve fitting line, and the dotted line is the 95% confidence interval (a). Scatter plot of the distribution of child Hb and IGF-1 SDS (b). Adjustment variables: age, height, weight, Cr, UA, FPG, estradiol, testosterone and pubertal stage. Cr: creatinine; UA: uric acid; FPG: fasting plasma glucose