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Qsauri
"B"

baseline imbalance
Guideline or reference source
CDISC Glossary of terms
ICHE9 Statistical principles for clinical trials
Definition
A systematic error in creating intervention groups, such that they differ with respect to prognosis. That is, the groups differ in measured or unmeasured baseline characteristics because of the way participants were selected or assigned. NOTE: also used to mean that the participants are not representative of the population of all possible participants  

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