US Only (Ultrasound Graf Classification Only)

US with CD (Ultrasound Graf Classification with CD^a)

≤28 Days

29 - 56 Days

>56 Days

Sig.

≤28 Days

29 - 56 Days

>56 Days

Sig.

(n = 1907)

(n = 720)

(n = 355)

(X²)^b

(n = 1907)

(n = 720)

(n = 355)

(X²)^b

False Positive (FP)

227 (11.9%)

11 (1.5%)

1 (0.3%)

109.01

***

260 (13.6%)

31 (4.3%)

7 (2.0%)

79.39

***

False Negative (FN)

0 (0.0%)

0 (0.0%)

2 (0.6%)

14.81

***

0 (0.0%)

0 (0.0%)

0 (0.0%)

…

…

True Positive (TP)

8 (0.4%)

2 (0.3%)

0 (0.0%)

1.67

…

8 (0.4%)

2 (0.3%)

2 (0.6%)

0.52

…

True Negative (TN)

1672 (87.7%)

707 (98.2%)

352 (99.2%)

104.97

***

1639 (85.9%)

687 (95.4%)

346 (97.5%)

77.05

***

Sensitivity^d

100.0%

100.0%

0.0%

n/a^c

100.0%

100.0%

100.0%

n/a^c

Specificity^e

88.0%

98.5%

99.7%

n/a^c

86.3%

95.7%

98.0%

n/a^c

Positive Predictive Value (PPV)^f

3.4%

15.4%

0.0%

n/a^c

3.0%

6.1%

22.2%

n/a^c

Negative Predictive Value (NPV)^g

100.0%

100.0%

99.4%

n/a^c

100.0%

100.0%

100.0%

n/a^c

Positive Likelihood Ratio (PLR)^h

8.37

65.27

0.00

n/a^c

7.30

23.16

50.43

n/a^c

Negative Likelihood Ratio (NLR)ⁱ

0.00

0.00

1.01

n/a^c

0.00

0.00

0.00

n/a^c

Accuracy^j

88.1%

98.5%

99.2%

93.62

***

86.4%

95.7%

98.0%

79.39

***