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 4 A comparison of the combined TUS and ultra-sonographic SLS results with the capnography results

Combined TUS and SLS	Capnography results				Total	P value
	Tracheal positive		Esophageal negative
	n	(%)	n	(%)
Tracheal (positive)	TP = 79	98.8%	FP = 5	25.0%	84	< 0.001^a
Esophageal (negative)	FN = 1	1.2%	TN = 15	75.0%	16	< 0.001^a
Total	80		20		100

TUS Tracheal ultrasonography, SLS Sliding lung sign; 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