Comparison of the patients’ baseline characteristics between the stone-free and residual fragments subgroups in the retrograde intrarenal surgery group
| Variable | SF (n=73) | RF (n=22) | p-value |
|---|---|---|---|
| Age (y) | 60.0 [51.5-67.0] | 58.0 [47.8-62.8] | 0.363a) |
| Gender Male Female |
44 (60.3) 29 (39.7) |
15 (68.2) 7 (31.8) |
0.503b) |
| BMI (kg/m2) | 24.0 [22.4-25.9] | 24.0 [22.3-27.4] | 0.761a) |
| Stone episodes First Recurrent |
41 (56.2) 32 (43.8) |
15 (68.2) 7 (31.8) |
0.315b) |
| Ureteral stent Absent Present |
0 (0.0) 73 (100.0) |
0 (0.0) 22 (100.0) |
- |
| Stone laterality Right Left Both Unilaterality Unilateral Bilateral |
31 (42.5) 24 (32.8) 18 (24.7) 55 (75.3) 18 (24.7) |
8 (36.4) 12 (54.5) 2 (9.1) 20 (90.9) 2 (9.1) |
0.133c) 0.145c) |
| Stone multiplicity Single Multiple |
34 (46.6) 39 (53.4) |
8 (36.4) 14 (63.6) |
0.398b) |
| Largest stone location Ureteropelvic junction Renal pelvis Upper calyx Mid calyx Lower calyx Staghorn |
1 (1.3) 17 (23.3) 14 (19.2) 3 (4.1) 38 (52.1) 0 (0.0) |
1 (4.5) 4 (18.2) 2 (9.2) 3 (13.6) 12 (54.5) 0 (0.0) |
0.281c) |
| Longest stone diameter (mm) | 10.0 [8.0-14.0] | 12.5 [10.0-15.0] | 0.063a) |
| Stone composition Calcium oxalate monohydrate Uric acid Struvite Mucin Mixed |
26 (35.6) 6 (8.2) 1 (1.4) 1 (1.4) 39 (53.4) |
7 (31.8) 1 (4.6) 0 (0.0) 0 (0.0) 14 (63.6) |
0.851c) |
Values are presented as the median [interquartile range] or number (%)
In cases of multiple stones, the location and size of the stones were measured based on the largest stone
Statistically significant at p<0.05
BMI: body mass index, SF: stone-free, RF: residual fragments
a)Mann Whitney U-test
b)Chi-square test
c)Fisher’s exact test