Fig. 4From: Evaluation of real-time tracheal ultrasound versus colorimetric capnography as a point of care tool for confirmation of endotracheal intubation: a randomized controlled studyComparison between group A (U.S group) and group B (colorimetric capnography group) according to their diagnostic performance for detecting the correct position of the ETT position. (PPV positive predictive value, NPV negative predictive value)Back to article page