Table 3: Predictive value of conventional US features and ARFI in 173 thyroid lesions.

BN
( )
CA
( )
Sensitivity
(%)
Specificity
(%)
PPV
(%)
NPV
(%)
Accuracy
(%)
Az
(95% CI)

US features
 Hypoechoic
 (including markedly hypoechoic)
94.8
(91/96)
27.3
(21/77)
61.9
(91/147)
80.8
(21/26)
64.7
(112/173)
0.610* 
(0.524, 0.696)
  Yes5691
  No215
 Spot microcalcification55.2
(53/96)
71.4
(55/77)
70.7
(53/75)
56.1
(55/98)
62.4
(108/173)
0.633* 
(0.550, 0.716)
  Yes2253
  No5543
 Shape (taller than wide)54.2
(52/96)
83.1
(64/77)
80
(52/65)
59.3
(64/108)
67.1
(116/173)
0.686 
(0.607, 0.766)
  Yes1352
  No6444
 Halo sign99.0
(95/96)
9.1
(7/77)
57.6
(95/165)
87.5
(7/8)
59.0
(102/173)
0.540* 
(0.453, 0.627)
  Yes71
  No7095
 Type III vascularity17.7
(17/96)
88.3
(68/77)
65.4
(17/26)
46.2
(68/147)
49.1
(85/173)
0.455* 
(0.368, 0.542)
  Yes917
  No6879
ARFI features
 VTI
 Elastography score > 4
61.4
(59/96)
88.3
(68/77)
86.8
(59/68)
64.8
(68/105)
73.4
(127173)
0.746 
(0.672, 0.850)
  Yes959
  No6837
 VTQ
 SWV > 3.10 m/s
56.2
(54/96)
79.2
(61/77)
77.1
(54/70)
59.2
(61/103)
66.5
(115/173)
0.702 
(0.625, 0.780)
  Yes1654
  No6142

Caption: BN, benign; CA, carcinoma; US, ultrasound; PPV, positive predictive value; NPV, negative predictive value.
In comparison with “VTI elastography score > 4”, .