1

Peak cough flow (L/s)

2

Average cough flow (L/s)

3

Maximum cough flow acceleration(L/s^{2})

4

Total cough volume (L)

5

Time at which 25% cough volume has been expelled/time at which 100% cough volume has been expelled

6

Time at which 50% cough volume has been expelled/time at which 100% cough volume has been expelled

7

Time at which 75% cough volume has been expelled/time at which 100% cough volume has been expelled

8

25% total time of cough/cough volume

9

50% total time of cough/cough volume

10

75% total time of cough/cough volume

11

Time at peak flow/total time

12

Crest Factor: maximum flow/Root Mean Square "RMS" flow

13

Form Factor: RMS flow/mean flow

14

Transit time: (s)

15

Skewness: where μ, and σ are the mean, and the standard deviation of the cough airflow signal respectively.

16

Kurtosis: where μ, and σ are the mean, and the standard deviation of the cough airflow signal respectively.

17

Cough flow variance

18

Cough flow variance normalized with respect to volume

1920

The top two principal components for flow*

2122

The top two principal components for volume*

2324

The top two principal components for Acceleration*


Frequency Series

25

Beta: the inverse power law 1/f^{β} of the power spectrum [22].

26

Wavelet parameter based on the variability in the wavelet detail coefficients found in the wavelet decomposition of the cough flow
