Table 1: The basic characteristics and ultrasound features for the 157 patients with 173 thyroid nodules.

CharacteristicsBenignMalignant

Patients ( )
 Sex (Male/Female)20/5115/710.108
 Age (yrs)54 ± 8 (32–71)49 ± 11 (22–78)0.001
 Single nodule/multiple nodules11/6020/660.224
Nodules ( )
 Diameter (mm)8.2 ± 1.4 (5–10)7.7 ± 1.5 (5–10)0.031
 Location0.507
  Left lobe31 39
  Right lobe4451
  Isthmus 26
 Echogenicity0.001*
  Markedly hypoechoic2046
  Hyperechoic10
  Isoechoic164
  Hypoechoic3645
  Mixed 41
 Calcifications0.001*
  None3934
  Microcalification2253
  Macrocalcification169
 Shape<0.001*
  Ovoid to round5539
  Taller than wide1352
  Irregular95
 Margin0.176
  Well-defined4850
  Ill-defined2946
 Halo sign0.023
  Present71
  Absent7095
 Vascularity<0.001*
  Type I5479
  Type II140
  Type III917

Caption: There were significant differences between benign and malignant nodules.
Significant differences were found in age of patients, diameter of nodules, echogenicity of nodules, calcification of nodules, shape of nodules, halo sign (all ). Significant differences were found between any two types of vascular patterns ( ). There was no significant difference in gender, solitary nodule or not, location of nodules and margin of nodules between benign and malignant nodules (all ).