Table 1.

Validity parameters for evaluating elastography strain ratio, endorectal ultrasonography (ERUS) and MRI differentiation of adenomas and adenocarcinomas.

Test validity parameter	ERUS (n = 115)	Elastography (n = 115)	MRI (n = 108)
Sensitivity	0.96 (0.90–0.99)	0.96 (0.90–0.99)	0.99 (0.94–1.00)
Specificity	0.62 (0.40–0.80)	0.86 (0.66–0.96)	0.07 (0.00–0.31)
Accuracy	0.90 (0.83–0.94)	0.94 (0.88–0.97)	0.87 (0.80–0.93)
PPV	0.92 (0.85–0.96)	0.97 (0.91–0.99)	0.88 (0.80–0.93)
NPV	0.76 (0.51–0.92)	0.82 (0.61–0.94)	0.50 (0.03–0.97)

Values are given as mean (95% CI), and 95% CIs were calculated using the Blyth–Still–Casella procedure.

NPV, negative predictive value; PPV, positive predictive value.