Levels of Evidence for Effectiveness
All or None Case-Series
All or none case-series describe a group of patients who either died before a certain treatment became available or who survived on the treatment. This type of study provides a strong level of evidence, as it shows that the treatment is effective in all cases.
WEB For Example
Levels 1a, 1b, and 1c in the original Levels were replaced with simply 1. 1c All or none Met when all patients died before the Rx became available but some now survive on it.
WEB Levels of Evidence for Effectiveness
Levels of evidence help researchers target their search at the type of evidence that is most likely to provide a reliable.
- A consistent level 1 studies
- B consistent level 2 or 3 studies or extrapolations from level 1.
تعليقات