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Table 3 Characteristics of stones

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%)  
Laterality     0.370
 Left 201 (52.6%) 144 (71.6%) 57 (28.4%)  
 Right 181 (47.4%) 137 (75.7%) 44 (24.3%)  
 RIPA (°) 47.91 ± 19.05 52.84 ± 18.51 43.50 ± 18.56 0.003a*
Inferior pole stone     <0.001*
 Yes 145 (38.0%) 69 (47.6%) 76 (52.4%)  
 No 237 (62.0%) 212 (89.5%) 25 (10.5%)  
 RIL (mm) 23.55 ± 7.53 22.17 ± 7.02 27.40 ± 7.61 <0.001a *
RIW (mm) 10 (13–8; 5) 10 (12–7; 5) 11 (14–8; 6) 0.036b*
Stone burden (mm) 14 (21–10; 11) 12 (17–9; 8) 25 (29–18; 11) <0.001b*
Numbers of stone     <0.001*
 Single 233 (61.0%) 200 (85.8%) 33 (32.7%)  
 Multiple 149 (39.0%) 81 (54.4%) 68 (45.6%)  
Renal stone density (Hu) 1067.76 ± 336.93 1022.59 ± 342.97 1193.43 ± 285.44 <0.001a*
Urine Culture     0.264
 Positive 45 (11.8%) 30 (66.7%) 15 (33.3%)  
 Negative 337 (88.2%) 251 (74.5%) 86 (25.5%)  
  1. RIPA renal infundibulopelvic angle, RIL renal infundibulopelvic length, RIW renal infundibular width
  2. *Statistical significance was set at P < 0.05
  3. aStudent’s t test, b Mann-Whitney U test