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Table 3 Means and standard deviations of 30 ECG waveform features in 4 lying positions

From: Lying position classification based on ECG waveform and random forest during sleep in healthy people

Lying positions

Left

Supine

Right

Prone

QT

442.234 ± 4.763

434.916 ± 4.907

439.099 ± 5.361

427.654

QTc

446.541 ± 11.936

448.476 ± 10.903

453.259 ± 10.506

440.679

RR

985.050 ± 15.378

946.057 ± 17.053

942.002 ± 16.838

944.844

PR inter

139.201 ± 3.113

139.811 ± 3.233

139.574 ± 2.526

164.698

PR segment

21.708 ± 3.162

24.096 ± 2.731

23.382 ± 2.766

58.389

ST inter

341.285 ± 8.573

331.296 ± 8.029

327.401 ± 8.539

352.817

ST segment

77.024 ± 10.596

71.534 ± 9.446

71.020 ± 8.098

86.649

P wide

117.493 ± 2.397

115.715 ± 2.548

116.192 ± 2.580

106.308

QS wide

65.397 ± 2.820

70.183 ± 2.684

73.107 ± 2.848

54.014

T wide

264.261 ± 5.653

259.763 ± 4.260

256.381 ± 5.765

266.168

TP segment

382.120 ± 9.830

350.049 ± 11.086

342.160 ± 9.964

330.975

P peak

0.138 ± 1.414

0.233 ± 2.303

0.222 ± 1.739

0.112

R peak

1.808 ± 11.290

2.428 ± 16.243

2.291 ± 10.299

1.184

S peak

0.655 ± 4.970

0.533 ± 5.212

0.551 ± 3.110

0.206

T peak

0.547 ± 2.812

0.776 ± 3.427

0.696 ± 3.662

0.553

QRS area

266.365 ± 108.806

389.564 ± 158.961

387.565 ± 144.974

179.905

T area

165.776 ± 59.467

228.880 ± 67.021

200.339 ± 74.594

139.677

Ta/QRSa

1.129 ± 0.365

1.153 ± 0.381

0.848 ± 0.361

1.036

QRSa–Ta

100.588 ± 81.630

160.684 ± 120.856

187.226 ± 123.533

40.228

Rp-Tp x

301.607 ± 4.836

294.935 ± 4.940

295.938 ± 5.479

296.884

Rp-Tp y

21.477 ± 10.474

28.500 ± 15.368

27.279 ± 9.478

11.814

Tp-te

116.747 ± 1.705

115.795 ± 1.878

118.661 ± 2.742

108.543

QR

3.228 ± 18.543

4.661 ± 30.424

4.431 ± 20.729

2.678

RS

2.463 ± 14.825

2.961 ± 18.830

2.841 ± 12.079

1.390

RT slope

0.361 ± 0.185

0.489 ± 0.267

0.472 ± 0.180

0.199

RS slope

5.142 ± 2.698

5.600 ± 3.576

5.106 ± 3.137

3.527

ST slope1

0.106 ± 0.097

0.116 ± 0.108

0.080 ± 0.039

− 0.028

S/R

0.365 ± 0.151

0.232 ± 0.154

0.258 ± 0.122

0.174

T/R

0.245 ± 0.177

0.242 ± 0.090

0.220 ± 0.100

0.336

Angle qsr

106.798 ± 29.477

126.956 ± 25.830

127.175 ± 24.154

127.711

  1. In this table, the time-limit features are calculated in millisecond (ms), the amplitude features are calculated in millivolt (mV), and the angle indicator is calculated in degree. Due to the fact that most subjects did not have prone, or only had several prone epochs in overnight sleep, the standard deviations of features in prone were not shown in this table
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