Abbreviations
RSV: respiratory syncytial virus
E LF: the expiration sound power in a low-frequency range
I LF: the inspiration sound power in a low-frequency range
E MF: the expiration sound power in a mid-frequency range
I MF: the inspiration sound power in a mid-frequency range
E/I LF: the expiration-to-inspiration sound power ratio in a low-frequency range
E/I MF : the expiration-to-inspiration sound power ratio in a mid-frequency range
AUC: area under the curve
AT: total area under the curve of 100 Hz to the highest frequency of the dBm power spectrum
A3: third area under the curve
B4: fourth area under the curve
RPF50: ratio of power and frequency at 50% of the highest frequency of the dBm power spectrum
RPF75: ratio of power and frequency at 75% of the highest frequency of the dBm power spectrum