| OSA | Obstructive sleep apnea |
| HRV | Heart rate variability |
| PSG | Polysomnography |
| REM | Rapid eye movement |
| AHI | Apnea–hypopnea index |
| LF | Low-frequency band power |
| HF | High-frequency band power |
| VLF | Very low-frequency band power |
| TP | Total power spectrum |
| BDI-II | Beck Depression Inventory II |
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