Analyze sites with at least this many subjects: Specify the number of subjects a site must have in the selected population in order to include in the analysis. To Specify a Value: Either enter the desired value in the text field or move the slider to the right or to the left to change the value. 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 that appears, to rescale the slider and click OK.