Definition

Intervention research

High
****

Further research is very unlikely to change the confidence in the estimate of effect

• RCTs
• Quasi-experimental research and repeated n=1 studies with  effect, process and cost-efficiency evaluation conducted

Moderate
***

Further research is likely to have an important impact on the confidence in the estimate of effect and may change the estimate

• Quasi-experimental research and repeated n=1 studies with effect evaluation conducted but no process and/ or cost-efficiency evaluation results

Low
**

Further research is very likely to have an important impact on the confidence in the estimate of effect and is likely to change the estimate

• Quasi-experimental research and repeated n=1 studies with process and/ or cost-efficiency evaluation results but without an effect evaluation being conducted
• Observational studies providing useful information for identifying possible associations and with process and/ or cost-efficiency evaluation being conducted

Very low
*

Any estimate of effect is uncertain

• Observational studies with  process and/ or cost-efficiency evaluation conducted but without providing useful information for identifying possible associations