Schedule of the assessments
| Time point | Enrolment | Allocation | Intervention | Follow-up | After 12 months |
|---|---|---|---|---|---|
| −1 day | 0 day | 1 days | After 3 months | ||
| Enrolment | |||||
| Eligibility screen | X | ||||
| Informed consent | X | ||||
| Allocation | X | ||||
| Interventions | |||||
| DSD | X | ||||
| PFDD | X | ||||
| Assessments | |||||
| Demographics | X | X | |||
| Symptoms/signs | X | X | X | X | |
| Syrinx | X | X | X | X | |
| Surgical morbidity | X | X | X | ||
| Re-operation | X | X | |||
| SF-12 PCS | X | X | X | ||
| CSP | X | X | X | ||
| Resource utilisation | X | X | X |
CSP, Chiari Symptom Profile; DSD, dural splitting decompression; PFDD, posterior fossa decompression with duraplasty; SF-12 PCS, SF-12 Physical Component Scale.