Table VIII–

–Spearman Correlation Between Airflow and Acoustic Measures (N=46)

		Airflow Measures of Cough
		Peak expiratory flow rate (L/s)		Peak expiratory pressure(mmHg)		Compression phase duration (s)		Peak expiratory flow rise time (s)		Cough volume acceleration (L/s2)
		Coeff.	P-value	Coeff.	P-value	Coeff.	P-value	Coeff.	P-value	Coeff.	P-value
Acoustic Measures of Cough Sounds	Energy (J/m^2)	0.09	0.53	0.11	0.46	−0.09	0.56	−0.31*	0.04	0.25	0.09
	Rise Time (S)	−0.22	0.14	−0.25	0.10	−0.13	0.40	0.40**	0.01	−0.43**	0.00
	Duration (S)	0.15	0.32	0.09	0.57	−0.18	0.24	−0.15	0.32	0.16	0.29
	Peak Power Density (dB FS)	0.03	0.82	0.06	0.68	0.05	0.74	−0.35*	0.02	0.27	0.07
	Inband Power (dB FS)	.08	0.60	0.10	0.51	−0.05	0.76	−0.33	0.03	0.26	0.09
	Peak Frequency (Hz)	−0.10	0.50	−0.12	0.41	0.10	0.54	0.35*	0.02	−0.35*	0.02
	50% Bandwid th (Hz)	0.28	0.06	0.05	0.75	−0.05	0.72	0.13	0.41	0.09	0.57
	90% Bandwidth (Hz)	0.17	0.26	−0.04	0.76	−0.03	0.83	−0.01	0.93	0.14	0.34
	Cough Ratio	0.02	0.89	−0.12	0.43	−0.21	0.15	−0.12	0.43	0.03	0.83
	Sound Pressure Level (dB)	0.19	0.21	0.12	0.43	0.04	0.81	0.04	0.79	−0.04	0.79

^*designates statistically significant improvement at P ≤ 0.05.

^**designates statistically significant improvement at P ≤ 0.01.