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Table 4 Correlation (r) of ECG-spectrogram and PSG respiratory indices

From: Distinct polysomnographic and ECG-spectrographic phenotypes embedded within obstructive sleep apnea

CPC metric RDI NREM-RDI REM-RDI CAI/hour of sleep Desaturation Index/hour of sleep
LFC index 0.50
[p: 0.021
0.52
[p: 0.024]
0.20
[p: 0.043]
0.21
[p: 0.041]
0.44
(p: 0.001)
e-LFC index 0.56
[p: 0.02]
0.59
[p: 0.001]
0.22
[p: 0.041]
0.25
[p: 0.031]
0.50
[p: 0.001]
e-LFCNB 0.39
[p: 0.021]
0.41
[p: 0.001]
0.14
[p: 0.071]
0.19
[p: 0.043]
0.36
P: [0.013]
LFC cycle time −0.01
[p: 0.601]
−0.01
[p: 0.311]
0.01
[p: 0.212]
−0.01
[p: 0.311]
−0.02
[p: 0.511]
e-LFC cycle time 0.09
[p: 0.413]
0.09
[p: 0.211]
0.08
[p: 0.412]
0.02
[p: 0.121]
0.41
[p: 0.013]
  1. LFC low frequency coupling; e-LFC elevated low frequency coupling; RDI respiratory disturbance index; REM rapid eye movement sleep; NREM non-rapid eye movement sleep; CAI central apnea index; CPC cardiopulmonary coupling