Table 3.

Summary of Passing-Bablok comparisons of the ventilatory variables measured with the pneumotachograph (PNT) and the non-contact vibrometer using airborne ultrasound (SONAR) during synchronous recordings of the two datasets (PNT-SONAR condition, BACK recordings).

SONAR-PNT condition BACK	BF (breath min-1)	TT S	TI S	TE S	VT/displacement L cm
Intercept A	0.07	0.13	0.20	0.09	-1.03
95% CI	(-2.53 to 2.09)	(-0.56 to 0.87)	(-0.99 to 0.95)	(-0.97 to 0.72)	(-5.21 to 0.14)
Slope B	1.01	0.97	1.04	0.96	3.00
95% CI	(0.87–1.20)	(0.78–1.14)	(0.53–1.97)	(0.61–1.28)	(1.02–10.00)
p-Value	p = 0.78	p = 0.18	p = 0.78	p = 0.99	p = 0.18

BF, breathing frequency; TT, breathing cycle period; TI, inspiratory time; TE, expiratory time; VT, tidal volume; s, second; L, liter.