Table 3.

Mean (standard deviation) data for the six voluntary cough airflow measures for ALS and healthy groups with associated p-values and Cohen’s d effect size.

Airflow Measures	ALS (SD)	Healthy (SD)	Sig. (p=)	Cohen’s d
Inspiratory Phase Duration (sec)	1.85 (0.75)	1.43 (0.68)	.028*	.592
Peak Inspiratory Flow Rate (L/s)	−1.11 (0.74)	−2.17 (1.08)	.000*	1.14
Compression Phase Duration (sec)	.39 (0.33)	.298 (0.12)	.151	N/A
Peak Expiratory Flow Rate (L/s)	5.78 (2.5)	7.44 (1.54)	.004*	.799
Peak Expiratory Rise Time (ms)	.11 (0.08)	.051 (0.03)	.000*	1.03
Cough Volume Acceleration (L/s/s)	112.90 (79.1)	176.53 (68.25)	.001*	.861

^*Alpha set at p<0.05.