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Table 3 ECG-spectrogram features in the APPLES

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

ECG-spectrogram metrics Mean ± SD (n = 671)
High frequency coupling % TST 38.9 ± 22.3
High frequency coupling duration (minutes) 151.4 ± 92.7
Low frequency coupling % TST 43 ± 20.2
Low frequency coupling duration (minutes) 164.1 ± 82
Elevated low frequency coupling % TST 20.8 ± 17.9
Elevated low frequency coupling duration (minutes) 79.4 ± 69.3
Narrow band coupling % TST 3.4 ± 8.1
Narrow band coupling duration (minutes) 12.9 ± 31.4
Very low frequency coupling % TST 16.1 ± 7.3
Very low frequency coupling duration (minutes) 61 ± 28.2
CPC e-LFC index/hour of sleep 20.6 ± 19.3
CPC e-LFC cycle time (seconds) 30.4 ± 8.1
CPC LFC index/hour of sleep 52.4 ± 24.9
CPC LFC cycle time (seconds) 31 ± 8.4
  1. TST total sleep time; CPC cardiopulmonary coupling; LFC low frequency coupling; e-LFC elevated-low frequency coupling