The short answer Two trials can report the exact same overall dropout rate and mean very different things. What matters just as much as the total percentage of people who left a study is whether they …
A Study Has Many Outcomes: Why the Primary One Matters
The Question Behind This Guide You're reading about a clinical study — maybe one a product cites, maybe one a doctor mentioned, maybe one you found searching for a condition. The summary lists …
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A Clinical Study Abstract: What to Check in the Full Report
An abstract is a summary, not the study A clinical study abstract is written to compress months or years of research into a few hundred words. That compression means the abstract usually leaves out …
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Clinical Trial Randomization: What It Balances and What It Cannot
The Short Answer Randomization is the step in a clinical trial where participants are assigned to a study group — such as a treatment group or a comparison group — by chance rather than by choice. …
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Trial Registration Dates: Was the Main Outcome Named Before Results
To check whether a trial's main outcome was named before results existed, compare the date the trial was registered with the date it started, then compare the primary outcome in the registry with the …
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Noninferiority Trials: When a Study Is Asking Whether an Option Is Not Much Worse
If you've come across a clinical study and the summary says something like "Drug B was not inferior to Drug A," you may assume the researchers just failed to show Drug B was better. That's usually the …