| AD | Anxiety disorder |
| ECG | Electrocardiogram |
| GAD | Generalized anxiety disorder |
| HF | High frequency |
| LF | Low frequency |
| MAD | Mixed anxiety disorder |
| OCD | Obsessive-compulsive disorders |
| PD | Panic disorder |
| PTSD | Post traumatic stress disorder |
| RR | R-peak to R-peak in ECG signal |
| RMSSD | Root mean square standard deviation |
| SAD | Social anxiety disorder |
| WD | Wearable device |
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