?:definition
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Specifies whether the activity is a key investigational activity for a study. EXAMPLE(S): A study focused on investigating the effectiveness of a drug will flag the substance administration of the drug or a study focused on determining the average blood pressure of a certain population will flag the blood pressure observation. OTHER NAME(S): NOTE(S): If a study has study agents, one or more of the study activities will presumably use the agent and have this indicator set to true.
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