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In research studies, mortality refers to the loss of participants during the course of a study — not necessarily due to death, but due to dropout, withdrawal, or unavailability of subjects.
🔍 In Research Context:
It’s also called “attrition”.
It can affect the validity and reliability of the results.
🔄 Two Types:
Experimental Mortality (or Subject Mortality):
When participants leave before the study ends, which may cause uneven groups or bias.
Mortality Threat (to Internal Validity):
If the dropouts differ significantly from those who remain, it can distort outcomes and make it unclear whether changes are due to the treatment or the dropout pattern.
🧠 Example:
If 20 people start a weight loss program study and 5 quit halfway, the results from the remaining 15 may no longer fairly represent the original group — especially if the 5 who quit were struggling the most.
For more information:nsda.portal.gov.bd/site/page/1595fdb5-339d-44f1-a7ea-b47476e1b1ee
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