Comparison of tidal breathing parameters measured in infants with SensorMedics 2600 (SM 2600) and flow-through technique (FTT)
| Parameter | Group means | Mean individual differences (95% CI) (SM 2600-FTT) | ||
| SM 2600 | FTT | Absolute difference | Relative difference % | |
| VT mL·kg−1 | 6.1±1.5 | 5.3±1.4 | 0.74 (0.5–1.0) | 12.9 (8.0–17.8) |
| fR min−1 | 58.6±13.0 | 49.5±11.8 | 9.0 (6.9–11.2) | 16.8 (12.8–20.9) |
| V′E mL·min−1·kg−1 | 349±97 | 258±74 | 92 (74–109) | 29.5 (24.5–34.5) |
| tE s | 0.61±0.16 | 0.74±0.19 | −0.12 (−0.16–−0.09) | −18.0 (−22.5–−13.4) |
| tPTEF/tE | 0.15±0.08 | 0.24±0.08 | −0.09 (−0.11–−0.08) | −53.5 (−62.4–−44.6) |
| VPTEF/VT | 0.20±0.09 | 0.29±0.07 | −0.085 (−0.1–−0.07) | −39.4 (−46.7–−32.0) |
| TEF25 L·min−1·kg−1 | 0.56±0.20 | 0.44±0.14 | 0.12 (0.09–0.16) | 23.2 (16.9–29.6) |
Group means are presented as mean±sd, within−subject differences between measurement techniques are shown as absolute and relative mean difference with the 95% confidence interval (CI): VT: tidal volume; fR: respiratory frequency; V′E: minute ventilation; tE: expiratory time; tPTEF/tE: time to peak tidal expiratory flow as a proportion of expiratory time; VPTEF/VT: volume to peak tidal expiratory flow as a portion of tidal volume; TEF25: expiratory flow when 25% of tidal volume remains in the lung.
for all p<0.001 for difference between SM 2600 and FTT.