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| Question type | Example | Type of study |
|
Therapy |
Is this intervention more effective than another? |
RCT |
| Diagnostic Test | How accurate is this diagnostic test? | Independent, blind comparison to a Gold Standard |
|
Prognosis |
What is the likely outcome, progression or survival time for this condition? |
Cohort Study > Case Control > Case Series |
| Harm / Etiology | What are the causes of this condition or state of affairs? | RCT > Cohort Study > Case Control > Case Series |
|
Prevention |
How to reduce the risk of disease | RCT > Cohort Study > Case Control > Case Series |
| Cost-effectiveness | Is intervention x more cost-effective than intervention y? | Economic Analysis |
|
Quality of Life |
What will be the quality of life for the patient with this condition following this intervention etc.? | Qualitative Study |