Frequency of scans without evidence for dopaminergic deficit (SWEDD) cases in some of the drug trials or imaging studies for Parkinson's disease (PD)
| Study (reference) | Number of SWEDD cases (%) |
|---|---|
| Elldopa1 | 21/142 (14.7) |
| InSPECT2 | 15/112 (13.3) |
| PRECEPT3 | 90/799 (11.3) |
| REAL-PET4 | 21/186 (11.2) |
| CALM-PD5 | 3/82 (3.6) |
| European FP-CIT study6 | 10/51 (19.6) |