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. 2019 Oct 7;7:2000410. doi: 10.1109/JTEHM.2019.2940900

TABLE 2. Details of Extracted Features From Each Sample. Mean: Average of Each Feature Values, Std: Standard Deviation of Each Feature Values. Inline graphic: PD Group of Training Database, Inline graphic: Healthy Group of Training Database, Inline graphic: PD Group of Testing Database, M: Mean, S: Standard Deviation.

Feature number Features Inline graphic Inline graphic Inline graphic Statistical comparisons
Description (M ± S) (M ± S) (M ± S) p value
1 Jitter (local) 0.79±0.66 0.77±0.75 0.64±0.82 0.0003
2 Jitter(local, absolute) 5.09e-05±4.29e-05 5.02e-05±5.20e-05 4.2e-05±5.5e-05 0.009
3 Jitter (rap) 0.42±0.41 0.392±0.466 0.33±0.44 0.007
4 Jitter (ppq5) 0.42±0.37 0.368±0.340 0.37±0.52 0.005
5 Jitter (ddp) 1.26±1.24 1.17±1.39 1.006±1.346 0.007
6 Shimmer (local) 7.18±3.38 6.85±5.48 5.162±3.060 0.006
7 Shimmer (local, dB) 0.681±0.34 0.62±0.45 0.47±0.26 <0.001
8 Shimmer (apq3) 3.53±2.09 3.54±3.09 2.67±1.79 0.039
9 Shimmer (apq5) 4.34±2.50 4.360±4.06 3.04±1.67 0.007
10 Shimmer (apq11) 6.23±3.38 5.34±3.78 4.21±2.03 0.001
11 Shimmer (dda) 10.59±6.29 10.62±9.87 8.03±5.38 0.039
12 Autocorrelation 0.94±0.051 0.93±0.089 0.96±0.048 0.001
13 Noise-to-Harmonic 0.066±0.077 0.092±0.151 0.051±0.083 <0.001
14 Harmonic-to-Noise 16.31±5.01 17.44±5.89 19.32±5.53 0.013
15 Median pitch 166.1±44.64 166.7±46.41 164.62±46.37 0.968
16 Mean pitch 166.3±44.58 169.8±47.14 163.94±46.18 0.928
17 Standard deviation 6.63± 4.57 14.2±23.80 4.99±7.11 <0.001
18 Minimum pitch 149.11±45.76 147.8±45.37 151.5±49.15 0.872
19 Maximum pitch 181.9±48.99 227.5±108.9 173.39±48.83 0.050
20 Number of pulses 390.7±350.8 321.4±205.09 157.60±46.90 <0.001
21 Number of periods 389.3±350.6 318.3±205.04 155.88±47.16 <0.001
22 Mean Period 0.0064±0.001 0.0062±0.001 0.0066±0.0021 0.958
23 Standard Dev. Of period 0.00027±0.0001 0.00040±0.00042 0.00024±0.00034 <0.001
24 Fraction of locally unvoiced frames 0.956±1.90 3.384±6.37 0.767±2.359 <0.001
25 Number of voice breaks 0.175±0.49 0.25±0.53 0.226±0.870 0.229
26 Degree of voice breaks 0.073±0.207 0.961±3.37 0.65±2.29 0.234