The target length of the Target Length of a screening interval on the Inteval the Attributes tab must be negative to indicate it's a screening interval and allow the "Determines Screening Status" box to be checked. and display the Screening Expression tab.
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StudyTRAX will only allow a negative Target Length if Screening is an enabled feature in the project |
The calculation to determine a subject's screening status for the interval is defined on the Screening Expression tab.
Project Features | Attributes (Interval Update) | Screening Expression (Interval Update) |
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