Table 2.
Descriptive statistics, including mean and standard error, for the dependent variables according to cough type (reflex or voluntary) and cough number (1 and 2).
| Cough number | Dependent variable | Reflex cough | Voluntary cough | ||
|---|---|---|---|---|---|
| Mean | Standard error | Mean | Standard error | ||
| Total coughs in epoch | 4.66 | 0.52 | 3.93 | 0.36 | |
| Cough inspired volume | 0.76 | 0.10 | 0.89 | 0.11 | |
| Cough 1 | CPD (seconds) | 0.71 | 0.28 | 0.32 | 0.07 |
| PEFR (L/s) | 2.40 | 0.12 | 3.23 | 0.39 | |
| PEFRT (seconds) | 0.05 | 0.01 | 0.05 | 0.00 | |
| CVA (L/s/s) | 55.22 | 5.92 | 61.80 | 5.04 | |
| CEV (Liters) | 0.51 | 0.05 | 0.66 | 0.10 | |
| Cough 2 | CPD (seconds) | 0.18 | 0.05 | 0.14 | 0.04 |
| PEFR (L/s) | 1.61 | 0.11 | 2.27 | 0.20 | |
| PEFRT (seconds) | 0.03 | 0.002 | 0.03 | 0.002 | |
| CVA (L/s/s) | 57.40 | 5.37 | 70.31 | 7.00 | |
| CEV (Liters) | 0.22 | 0.03 | 0.32 | 0.04 | |
Note: CPD is compression phase duration; PEFR is peak expiratory flow rate; PEFRT is peak expiratory flow rise time; CVA is cough volume acceleration; CEV is cough expired volume.