Table 1.
Mean voluntary cough waveform measures for safe (PAS≤2) vs. unsafe (PAS≥3) swallowers. Three measures in the expiratory phase of voluntary cough airflow were significantly different (p<0.05) across airway safety groups. Note that peak expiratory flow rise time was converted to milliseconds.
| Measure: | Safe Swallowers Mean SEM (95% CI) |
Unsafe Swallowers Mean SEM (95% CI) |
P Value |
|---|---|---|---|
| Peak inspiratory flow rate (L/s) |
-1.77 0.12 (-2.02, -1.52) |
-1.45 0.18 (-1.82, -1.09) |
0.78 |
| Inspiratory phase duration (s) |
1.47 0.07 (1.33, 1.62) |
1.43 0.15 (1.13, 1.74) |
0.14 |
| Compression phase duration (s) |
0.28 0.03 (0.22, 0.34) |
0.33 0.03 (0.26, 0.40) |
0.28 |
| Peak expiratory flow rise time (ms) |
78.8 11.9 (54.7, 102.9) |
159.2 27.3 (102.7, 215.6) |
0.003* |
| Peak expiratory flow rate (L/s) |
5.31 0.35 (4.61, 6.01) |
2.88 0.40 (2.06, 3.70) |
0.00005* |
| Cough volume acceleration (L/s/s) |
103.71 9.66 (84.24, 123.18) |
33.21 8.69 (15.24, 51.18) |
0.00001* |
*
significant difference.