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Why the source matters
A single study rarely settles anything. What moves the needle is the weight of evidence: several independent groups, different methods, converging on the same answer.
- Randomised trials are strongest for “does this cause that”.
- Cohort studies are useful when a trial would be impractical.
- Case reports describe what happened once, and are a starting point, not a conclusion.
Reading a claim
When you see a headline, three questions get you most of the way:
- Who was studied, and are they like you?
- How big was the effect, in numbers you can picture?
- Compared with what?