Table 1 Level of evidence for interventions
From: Paediatric palliative care: recommendations for treatment of symptoms in the Netherlands
Level of evidence | Evidence is based on: |
|---|---|
Level 1 | Systematic review or at least two randomized clinical trials of good quality |
Level 2 | One randomized clinical trial or at least two case–control studies |
Level 3 | One case–control study or one cohort study |
Level 4 | Textbook or expert opinion |