222 chapter 2 Figure 67. SROC curves of individual ultrasound characteristics Summary receiver operating characteristic plot showing sensitivity versus 1-specificity of individual ultrasound characteristics in indeterminate thyroid nodules (left column) with available histopathology, including Bethesda III and IV subgroups (middle and right columns, respectively). AUC, area under the curve; n.a., not applicable; n.a.c., not able to calculate; SROC, summary receiver operating characteristic. Solitary nodule all indeterminate thyroid nodules Bethesda III nodules Bethesda IV nodules Solid appearance Hypoechogenicity n.a.c. AUC = 0.52 (0.48-0.56) AUC = 0.50 (0.45-0.54) AUC = 0.62 (0.58-0.66) AUC = 0.55 (0.51-0.60) AUC = 0.62 (0.58-0.66) AUC = 0.66 (0.62-0.70) AUC = 0.73 (0.69-0.77) AUC = 0.62 (0.58-0.66) AUC: area under the summary receiver operating characteristic curve. n.a.: not applicable. n.a.c.: not able to calculate.
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