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Table 2 Demographics of patients and clinical data

From: The R.I.R.S. scoring system: An innovative scoring system for predicting stone-free rate following retrograde intrarenal surgery

  No. of patients SF Non-SF P value
No. of patients (%) 382 281 (73.6%) 101 (26.4%)  
Gender     0.017*
 Male 256 (67.0%) 198 (77.3%) 58 (22.7%)  
 Female 126 (33.0%) 83 (65.9%) 43 (34.1%)  
Age (yo) 51.93 ± 12.32 52.14 ± 12.19 51.37 ± 12.74 0.590a
Hypertention     0.069
 Yes 120 (31.4%) 81 (67.5%) 39 (32.5%)  
 No 262 (68.6%) 200 (76.3%) 62 (23.7%)  
Diabetes mellitus     0.030*
 Yes 36 (9.4%) 21 (57.3%) 15 (41.7%)  
 No 346 (90.6%) 260 (75.1%) 86 (24.9%)  
 BMI (kg/m2) 21.68 (23.79–19.1; 4.69) 21.57 (23.63–19.13; 4.50) 22.07 (24.29–19.08; 5.21) 0.406b
History of surgery     0.064
 SWL 13 (3.4%) 11 (84.6%) 2 (15.4%)  
 URL or RIRS 36 (9.4%) 22 (61.1%) 14 (38.9%)  
 PNL 29 (7.6%) 16 (55.2%) 13 (44.8%)  
 Laparoscopic ureterolithotomy 15 (3.9%) 13 (86.7%) 2 (13.3%)  
 Pyuloplasty 3 (0.8%) 1 (33.3%) 2 (66.7%)  
 Open surgery 3 (0.8%) 2 (66.7%) 1 (33.3%)  
 No 294 (77.0%) 223 (75.9%) 71 (24.1%)  
UAS     0.927
 Yes 373 (97.6%) 275 (73.7%) 98 (26.3%)  
 No 9 (2.4%) 6 (66.7%) 3 (33.3%)  
Relocation     0.317
 In situ 346 (90.6%) 252 (72.8%) 94 (27.2%)  
 Ex situ 36 (9.4%) 29 (80.6%) 7 (19.4%)  
Duration of procedure (min) 50 (60–40; 20) 50 (60–40; 20) 60 (85–50; 35) <0.001b*
Hospitalization (days) 5 (7–4; 3) 5 (6–3; 3) 6 (7–4; 3) <0.001b*
Complications     0.008*
 Yes 27 (7.1%) 14 (51.9%) 13 (48.1%)  
 No 335 (92.9%) 267 (75.2%) 88 (24.8%)  
  1. *Statistical significance was set at P < 0.05
  2. UAS: Ureteral Access Sheath
  3. aStudent’s t test, b Mann-Whitney U test