Table 4. Top (22) selected features using the wrapper, embedded and their statistical U-test.

Rank	Features	U	P	Rank	Features	U	P
1	Mean time of all speech segments excluding filler words	17.0	0.00007	12	Mean response time	42.0	0.004
2	Ratio of max speech segment to the max pause time	19.0	0.0001	13	VAR degree of voice breaks	44.0	0.004
3	STD of total speech segments time excluding filler words	19.0	0.0001	14	STD of number of voice breaks	44.5	0.004
4	STD of the speech segments time	20.0	0.0001	15	Mean degree of voice breaks	45.5	0.005
5	VAR of total speech segments time excluding filler words	20.0	0.0001	16	Mean of Fbank coefficients	49.0	0.008
6	Ratio of max pause time to the total turn time	24.0	0.0002	17	Min of Fbank coefficients	49.5	0.009
7	Ratio of total pauses time to the total turn time	24.5	0.0002	18	VAR of SSC coefficients	52.5	0.01
8	Ratio of total speech segments time to the total turn time	26.0	0.0003	19	STD of SSC coefficients	59.5	0.02
9	VAR of number of voice breaks	26.0	0.0003	20	STD of MFCC coefficients	60.0	0.03
10	Ratio of total No. of pauses to the total turn time	27.0	0.0003	21	VAR of Fbank coefficients	60.5	0.03
11	Mean number of voice breaks	30.0	0.0006	22	Mean of MFCC coefficients	63.0	0.04

U: Mann-Whitney u-tests.

Sample size n₁ = n₂ = 15.