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Table 1 Registry-based randomised controlled trial (RRCT) characteristics

From: Defining key design elements of registry-based randomised controlled trials: a scoping review

 N studies
Population size
  ≤ 1001
  > 100–5002
  > 500–15002
  > 1500–50007
  > 50005
Trial duration
  ≤ 12 months6
  > 12–18 months3
  > 18–36 months7
  > 60 months1
Outcome measures
 Intervention uptake7
 Mortality7
 Health outcomes8
 Performance outcomes1
Follow-up period
  ≤ 3 days1
 2–4 weeks2
 2–5 months4
 6–11 months5
 1–2 years2
  > 3 years1
 Not applicable2
Loss to follow-up
 0%5
 1–5%3
 6–10%1
  > 10%1
 Not reported5
 Not applicable2