From: Assessing the accuracy of ultrasound measurements of tracheal diameter: an in vitro experimental study
Tracheal diameter
Precision electronic Vernier caliper
Ultrasound
OTD
26.64 ± 2.12
26.83 ± 2.00
ITD
21.59 ± 1.71
21.26 ± 2.04
ATWT
3.64 ± 0.57
3.42 ± 0.57