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Overview of the included studies reporting on original (newly recorded) datasets from neurological disorders to provide a survey over emerging trends in the field.
| Disorder | # studies | Patients | Controls |
|---|---|---|---|
| Median (range) | Median (range) | ||
| Parkinson's | 20 | 36 (3–1,513) | 20 (8–64) |
| Stress | 6 | - | 44 (4–60) |
| Depression | 5 | 92 (12–224) | 61 (12–397) |
| Speech impairments | 4 | 12 (8–21) | 13 (8–21) |
| Alzheimer's | 3 | 82 (71–214) | 93 (82–268) |
| ALS | 3 | 13 (11–25) | 12 (11–13) |
| Bipolar | 2 | 31 (10–51) | 9 (9) |
