Table 5.

Coefficients of variations of the ventilatory variables measured with the non-contact vibrometer using airborne ultrasound during synchronous pneumotachograph-SONAR recordings (SONAR-PNT) and with the SONAR only (SONAR-only).

SONAR signal	TT S	TI S	TE S	Displacement cm
In SONAR-PNT condition	0.09 (0.08–0.12)	0.12 (0.10–0.16)	0.11 (0.10–0.16)	0.18 (0.15–0.22)
In SONAR-only condition	0.11 (0.08–0.15)	0.15 (0.14–0.16)	0.14 (0.11–0.22)	0.23 (0.16–0.29)
p-Value	0.74	0.18	0.52	0.19

Data are presented as median (Q1–Q3). TT, breathing cycle period; TI, inspiratory time; TE, expiratory time; s, second.