Endoscopic ultrasound elastography strain histograms in the evaluation of patients with pancreatic masses

Table 1 Analysis of the diagnostic validity of the Mode 1 histogram measure in the differentiation of pancreatic masses

	Malignant pancreatic tumor
	Yes	No
Mode 1
Indicative < 86	True positive	False positive	Positive predictive value
	58/58	50/91	54% (50%-54%)
Non indicative ≥ 86	False negative	True negative	Negative predictive value
	0/58	41/91	100% (90%-100%)
	Sensitivity	Specificity
	100% (93%-100%)	45% (41%-45%)

Table 2 Analysis of the diagnostic validity of the new combined histogram measure (Mode2/Mode1) in classifying malignancies

	Malignant pancreatic tumor
	Yes	No
Mode 2/Mode 1
Indicative ≥ 1.153	True positive	False positive	Positive predictive value
	57/58	46/91	92% (87%-92%)
Non indicative < 1.153	False negative	True negative	Negative predictive value
	1/58	45/91	100% (96%-100%)
	Sensitivity	Specificity
	98% (91%-100%)	50% (45%-50%)