Tidal volumes, respiratory rates, and inspiratory and expiratory times before (baseline) and with the added dead space
| Baseline | Added dead space | p Value | |
|---|---|---|---|
| Data are median (range). | |||
| Ti, Inspiratory time; Te, expiratory time. | |||
| Non-smoking mothers | |||
| Tidal volume (ml/kg) | 3.6 (2–6) | 5.4 (4–8.8) | 0.0001 |
| Respiratory rate (breaths/min) | 42 (28–71) | 49 (27–74) | 0.0001 |
| Ti (seconds) | 0.6 (0.4–1.1) | 0.6 (0.4–1.1) | 0.02 |
| Te (seconds) | 0.8 (0.4–1.4) | 0.7 (0.4–1.2) | 0.074 |
| Smoking mothers | |||
| Tidal volume (ml/kg) | 3.8 (2.6–7) | 6 (3.2–12) | 0.0004 |
| Respiratory rate (breaths/min) | 34 (27–59) | 43 (25–67) | 0.02 |
| Ti (seconds) | 0.6 (0.4–1) | 0.6 (0.4–0.8) | 0.53 |
| Te (seconds) | 1.1 (0.6–1.5) | 0.8 (0.6–1) | 0.055 |