Use site active date from the Risk Data Set, if available Check this box to use the site active date from the Study Risk Data Set from Update Study Risk Data Set report. If this box is not checked, the minimum of ADSL.RANDDT (or DM.RFSTDTC , if RANDDT not available) within the site is used to determine when a site became active. Study day within the site is calculated relative to the site active date. To Specify This Option: Click within the check box.