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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