Fig. 2.

Receiver operating characteristic (ROC) curve of initial serum TSH, L-thyroxine dose at 12 months of age (12M dose), and 24 months of age (24M dose) reflecting transient congenital hypothyroidism. The cutoff values of 12M dose and 24M dose were 3.25 µg/kg (area under the curve=0.799; 95% CI, 0.678-0.919; P<0.001; sensitivity, 87.1%; specificity, 68.0%) and 3.25 µg/kg (area under the curve=0.925; 95% CI, 0.837-1.000; P<0.001; sensitivity, 93.5%; specificity, 88%), respectively. TSH, thyroid-stimulating hormone; CI, confidence interval.