When we talk about clinical trials, we often hear terms like “randomised” or “double-blind,” but what do these mean — and how strong is the evidence they produce?
Here’s a brief guide:
1. Observational Study
- Researchers observe patients without changing treatments.
- Example: watching CPA patients on current antifungals to track outcomes.
- Power: Weak to moderate — shows correlation but not cause.
2. Open-Label Trial
- Everyone knows which treatment they’re getting.
- Useful for testing safety or feasibility.
- Power: Moderate — can be biased, but still useful.
3. Randomised Controlled Trial (RCT)
- Participants are randomly assigned to one treatment or another.
- Helps ensure fairness and balance between groups.
- Power: Strong — considered the gold standard for testing effectiveness.
4. Double-Blind RCT
- Neither patient nor doctor knows who is getting the real treatment or the control.
- Reduces bias even further.
- Power: Very strong — this is the highest standard for reliable evidence.
5. Feasibility or Pilot Trial
- A smaller version of a full RCT, used to test if a larger trial is possible.
- Checks things like recruitment, adherence, and side effects.
- Power: Lower for proving treatment works, but crucial for planning a full trial
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