Table 3. Two-by-two tables of the ECHAS (Emergency Call for Heart Attack and Stroke) app triage advice versus adjudicators’ determination of appropriateness of emergency department visit.

ECHAS app		Positive	Negative	Sensitivity	Specificity
Adjudicator 1				0.98	0.08
	Positive	159	34
	Negative	4	3
Adjudicator 2				0.97	0.07
	Positive	153	40
	Negative	4	3