Roles of contrast-enhanced ultrasonography in identifying volume change of benign thyroid nodule and optical time of secondary radiofrequency ablation

Table 1 Characteristics of all patients and nodules

Variables	Characteristics
Age (years)^a	46.70 ± 13.05
Gender, n (%)
male	18 (17.1)
female	87 (82.9)
Nature, n (%)
Solid	49 (46.7%)
Solid-cystic	56 (53.3%)
Vt (ml)^a	13.38 ± 13.71
Vt < 10 ml	60
Vt 10-20 ml	25
Vt 20 ml -30 ml	11
Vt > 30 ml	9
Total energy	2.51 ± 1.84
Energy/volume	0.29 ± 0.18
Symptoms
Compression and/or cosmic problem	67
Thyroid function tests^b
TSH	1.31 (0.85–2.06)
fT3	4.74 (4.45–5.18)
fT4	15.79 (14.39–16.83)

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