Table 1 Registry-based randomised controlled trial (RRCT) characteristics
From: Defining key design elements of registry-based randomised controlled trials: a scoping review
| Â | N studies |
|---|---|
Population size | |
  ≤ 100 | 1 |
  > 100–500 | 2 |
  > 500–1500 | 2 |
  > 1500–5000 | 7 |
  > 5000 | 5 |
Trial duration | |
  ≤ 12 months | 6 |
  > 12–18 months | 3 |
  > 18–36 months | 7 |
  > 60 months | 1 |
Outcome measures | |
 Intervention uptake | 7 |
 Mortality | 7 |
 Health outcomes | 8 |
 Performance outcomes | 1 |
Follow-up period | |
  ≤ 3 days | 1 |
 2–4 weeks | 2 |
 2–5 months | 4 |
 6–11 months | 5 |
 1–2 years | 2 |
  > 3 years | 1 |
 Not applicable | 2 |
Loss to follow-up | |
 0% | 5 |
 1–5% | 3 |
 6–10% | 1 |
  > 10% | 1 |
 Not reported | 5 |
 Not applicable | 2 |