Table 2.
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, FRONT recordings).
| SONAR-PNT condition FRONT | BF (breath min-1) | TT S | TI S | TE S | VT/displacement L cm |
|---|---|---|---|---|---|
| Intercept A | 0.12 | -0.04 | 0.30 | 0.30 | -9.63 |
| 95% CI | (-0.53 to 0.14) | (-0.17 to 0.03) | (-0.44 to 0.97) | (-0.41 to 1.09) | |
| Slope B | 1.01 | 1.01 | 1.05 | 0.78 | 18.86 |
| 95% CI | (0.99–1.04) | (0.99–1.04) | (0.56–1.46) | (0.55–1.06) | |
| p-Value | p = 0.78 | p = 0.42 | p = 0.42 | p = 0.99 | p = 0.97 |
| SONAR-PNT condition FRONT | CV BF | CV TT | CV TI | CV TE | CV VT/CV displacement |
| Intercept A | 0 | 0 | 0.01 | 0.01 | 0.12 |
| 95% CI | (-0.01 to 0.03) | (-0.01 to 0.01) | (-0.06 to 0.08) | (-0.05 to 0.04) | (0.01–0.17) |
| Slope B | 1 | 1 | 1 | 1 | 0.4 |
| 95% CI | (0.75–1.13) | (0.88–1.14) | (0.50–1.67) | (0.78–1.44) | (0.00–1.00) |
| p-Value | p = 0.98 | p = 0.74 | p = 0.72 | p = 0.45 | p = 0.26 |
BF, breathing frequency; TT, breathing cycle period; TI, inspiratory time; TE, expiratory time; VT, tidal volume; s, second; L, liter; CV, coefficient of variation.