Table 4.
List of design details different in epidemiological studies
| Design feature | Examples |
|---|---|
| Dystonia definition | DMRF definition |
| ICD definition | |
| DSM definition | |
| Dystonia classification | Segmental dystonia |
| Multifocal dystonia | |
| Generalised dystonia | |
| Psychogenic dystonia | |
| Dystonic tremor | |
| Diagnostic criteria | Definition of dystonic tremor |
| Definition of psychogenic dystonia | |
| Definition of oromandibular dystonia/bruxism | |
| Diagnostic quality | Media campaign and self-reporting |
| Non-specialists | |
| Movement disorders specialists | |
| Multiple independent examiners | |
| Dystonia severity | No relevance threshold (door-to-door survey) |
| Treatment threshold (service based designs) | |
| Time and place of data acquisition | Since 1970 |
| Public and medical awareness | |
| Availability of classification systems | |
| Availability of treatment options | |
| Availability of reliable data bases | |
| Sample size of dystonia population | 1–879 [3] |
| Sample size of reference population | 707–5.8mio [12] |
| Type of reference population | Ethnic composition |
| Type of data base | Central registries |
| Local data base in movement disorders centre | |
| Health care system structure | Centralised system |
| De-centralised system |