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_Optional
_Natural language description of the characteristic
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_Whether the characteristic includes or excludes members
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_mean | median | mean-of-mean | mean-of-median | median-of-mean | median-of-median
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_What time period do participants cover
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definitionWhat code or expression defines members?
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definitionWhat code or expression defines members?
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definitionWhat code or expression defines members?
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definitionWhat code or expression defines members?
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definitionWhat code or expression defines members?
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definitionWhat code or expression defines members?
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descriptionNatural language description of the characteristic
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excludeWhether the characteristic includes or excludes members
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extensionAdditional content defined by implementations
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groupmean | median | mean-of-mean | mean-of-median | median-of-mean | median-of-median
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idUnique id for inter-element referencing
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modifierExtensions that cannot be ignored even if unrecognized
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participantWhat time period do participants cover
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participantWhat time period do participants cover
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participantWhat time period do participants cover
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participantWhat time period do participants cover
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timeObservation time from study start
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usageWhat code/value pairs define members?
What code or expression defines members?