Table 1 Patient characteristics, surgery specific characteristics and stone characteristics. The first part of the table gives information about general characteristics of the patients such as gender and age. The information on gender distribution is given in absolute numbers and percentages in relation to the total number of patients. The average age of the patients is given in years and is represented by the mean value together with the standard deviation. The second part of the table summarizes surgery specific characteristics for example in how many patients an ureteral stent was placed pre- and postoperatively, whether an access sheath was needed, whether an additional rigid ureterorenoscopy was performed in the same surgery and whether a laser was needed for stone fragmentation. The information is given in absolute numbers and percentages in relation to the total number of patients. The third part of the table provides detailed information on the characteristics of the patients’ renal stones. The total number of renal stones found in all patients is given as well as the average number of stones found per patient and group. The latter is represented by the mean value together with the standard deviation. Furthermore, it provides an overview on the local distribution of the stones in the pelvicalyceal system (ureter, renal pelvis, upper calyx, middle calyx, lower calyx). For each location the number of stones found as well as their percentage in relation to the total number of stones are given. Additionally, the table provides information on the average size of the renal stones found and is given for each group and each location in the pelvicalyceal system. Average stone size is given in millimeters and is represented by its mean value together with the standard deviation.
