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 3 Comparison of ultra-sonographic (SLS results) results with the continuous capnography waveform results

SLS	Capnography results				Total	P value
	Tracheal positive		Esophageal negative		Total	P value
	n	(%)	n	(%)
Present (bilaterally)	TP = 75	93.8%	FP = 3	15.0%	78	< 0.001^a
Absent (either bilaterally or unilaterally)	FN = 5	6.2%	TN = 17	85.0%	22	< 0.001^a
Total	80		20		100

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