The diagnostic accuracy of an inclusive three-window ultrasonography assessment for the rapid authentication of endotracheal tube position in RICU

The Egyptian Journal of Bronchology

Table 5 A comparison of DUS results with the capnography results

DUS	Capnography results				Total	P value
	Tracheal positive		Esophageal negative
	n	(%)	n	(%)
Tracheal (Positive)	TP = 74	92.5%	FP = 3	15.0%	77	< 0.001^a
Esophageal (Negative)	FN = 6	7.5%	TN = 17	85.0%	23	< 0.001^a
Total	80		20		n = 100

DUS Diaphragm motion ultrasonography; data are presented as number and percentage (%) (n No. of patients, TP True positives, FP False positives, FN False negatives, TN True negatives
^aFisher’s exact test