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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