Comparison of resistive index and shear-wave elastography in the evaluation of chronic kidney allograft dysfunction

Table 1 Diagnostic performance of shear-wave elastography in chronic renal allograft dysfunction, n (%)

Shear-wave elastography results	Histopathological results		Total
	Positive	Negative
Positive	54 (TP)	3 (FP)	57 (37.01)
Negative	4 (FN)	93 (TN)	97 (62.98)
Total	58 (37.66)	96 (62.33)	154 (100)
Sensitivity	54/58	93.10
Specificity	93/96	96.87
Positive predictive value	54/57	94.73
Negative predictive value	93/97	95.87
Diagnostic accuracy	(54 + 93)/154	95.45

TP: True positive; FP: False positive; FN: False negative; TN: True negative.

Table 2 Diagnostic performance of resistive index on Doppler ultrasound in chronic kidney allograft dysfunction, n (%)

Resistive index results	Histopathological results		Total
	Positive	Negative
Positive	40 (TP)	17 (FP)	57 (37.01)
Negative	12 (FN)	85 (TN)	97 (62.98)
Total	52 (33.76)	102 (66.23)	154 (100)
Sensitivity	40/52	76.92
Specificity	85/102	83.33
Positive predictive value	40/57	70.17
Negative predictive value	85/97	87.62
Diagnostic accuracy	(40 + 85)/154	81.16

TP: True positive; FP: False positive; FN: False negative; TN: True negative.