Stone-free and complication rates according to the stent dwelling time. The horizontal axis represents dwelling time in weekly intervals, e.g., 0–7 days are shown in the 1st week, 7–14 days in the 2nd week, and 14–21 days in the 3rd week. Bars represent the number of ureteroscopies performed each week, the green line indicates the stone-free rate and the red line indicates the complication rate in the corresponding intervals.