. 2020 Aug 3;20(15):4323. doi: 10.3390/s20154323

Table 1.

Feature selection from PSG signals and their results (feature Nos. 1–62 from Electrocardiography (ECG) signals, Nos. 63–66 from SaO₂ signals, Nos. 67–75 from airflow signals, Nos. 76–81 from abdominal signals and Nos. 82–87 from thoracic signals. Dashed lines divide the table according to the features of different signals).

Feature	λ_feature	Feature	λ_feature
1*.RMSSD_R_amp	3	44*.var_RR_0.03/0.4	1
2*.NN50_RR	5	45*.spectral flatness	1
3*.SDSD_RR	3	46.spectral centroid	0
4*.tSD_RR	4	47*.spectral spread	5
5*.std_RR	4	48*.spectral decrease	3
6.mean	0	49*.spectral slope	2
7*.var	4	50*.V_MAX	3
8*.kurtosis	4	51*.DET	4
9*.mean_RR	4	52*.LAM	3
10*.CV_EDR	2	53.SCrC_1_RR	0
11*.mean_R_amp	1	54*.SCrC_2_RR	2
12*.var_EDR_D9	2	55*.SCrC_3_RR	2
13.var_EDR_D2	0	56*.SCrC_4_RR	4
14*.entropy_D1	3	57*.SCrC_5_RR	1
15*.entropy_D2	3	58*.std_PCA	1
16*.entropy_D3	3	59*.std_kPCA	1
17*.entropy_D4	3	60*.max_dia_PCA	4
18*.entropy_D5	3	61*.max_dia_kPCA	4
19*.entropy_D6	2	62*.RP_2_PC	2
3-4[0.8pt/2pt] 20*.entropy_D7	2	63*.med	4
21.entropy_A7	0	64*.RES4	5
22.mean_D1	0	65*.mean_PSD_0.016/0.05	4
23.mean_D2	0	66*.SD₁	5
3-4[0.8pt/2pt] 24.mean_D3	0	67*.mean	2
25.mean_D4	0	68*.med	3
26.mean_D5	0	69*.std	3
27*.mean_D6	1	70*.mean_PSD_0/0.1	3
28.mean_D7	0	71*.mean_PSD_0.4/0.5	2
29.mean_A7	0	72.mean_D1	0
30*.var_D1	3	73.mean_D2	0
31*.var_D2	4	74.mean_D3	0
32*.var_D3	4	75*.mean_A3	2
3-4[0.8pt/2pt] 33*.var_D4	3	76*.sum_abs	4
34*.var_D5	4	77*.std_abs	5
35*.var_D6	3	78*.mean	4
36*.var_D7	1	79*.mean_PSD_80/100	2
37.var_A7	0	80.mean_D1	0
38*.WSD_RR	3	81.mean_D2	0
3-4[0.8pt/2pt] 39*.WSD_R_amp	4	82.sum	0
40*.max_PSD_0.03/0.5	3	83*.std	3
41*.mean_PSD_10/20	4	84*.med	4
42*.mean_PSD_80/100	4	85.mean	0
43*.var_EDR_0.03/0.4	1	86*.var	3
		87.mean_PSD_80/100	0