Parameters | Clinical | Summarize sites with at least this many subjects:

Summarize sites with at least this many subjects:
Specify the number of subjects a site must have in the selected population in order to include it in the summary.
To Specify the Cutoff:
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Tip: To change the scale of the slider, right-click on the slider and select Rescale Slider from the pop-up menu. Change the upper or lower boundaries in the window that appears, to rescale the slider and click OK.