Part 1Why an extra panel
Investigators are usually kept blind to group results to protect the study. Someone still needs to watch for problems, so an independent board takes on that role.
Part 2Interim looks
At planned points the board reviews the data so far. The schedule is written in advance so the reviews do not distort the final result.
Part 3Stopping early
A board may recommend stopping if one group appears to be harmed, if the answer is already clear, or if the study cannot realistically answer its question.
Part 4What it means for readers
When a news story says a study was stopped early, it helps to ask why. The reason changes what the result means, and the published report usually explains it.
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