?:definition
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The relative timing for a performed activity expressed as the number of days offset from the study-defined reference activity (e.g. date of registration, start of treatment) for this particular subject. EXAMPLE(S): Day 1, Days 10-20; OTHER NAME(S): Study Day; NOTE(S): Derived from the dateRange of this activity minus the dateRange of the reference activity + 1. The study-defined reference activity can be different from study to study. The study day for a date after this reference activity is a positive integer calculated as the difference in the two dates + 1. The study day for dates before the reference activity is a negative integer calculated as the difference between the two dates. Note that this means there is no \'Day 0.\'
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