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Table 1 The demographic and clinical data of the 147 patients and the stone characteristics used to calculate the R.I.R.S. score

From: External validation of the R.I.R.S. scoring system to predict stone-free rate after retrograde intrarenal surgery

 

No. of the patient (%)

SF

Non-SF

P value

No. of the patient (%)

147

105 (71.43%)

42 (28.57%)

 

Gender

   

0.949a

 Male

116 (78.91%)

83 (71.55%)

33 (28.45%)

 

 Female

31 (21.09%)

22 (70.97%)

9 (29.03%)

 

Age

52.00 (61.00–40.00; 21)

53.00 (59.50–38.50; 21.00)

50.00 (63.25–42.25; 21.00)

0.494d

Hypertension

   

0.544a

 Yes

27 (18.37%)

18 (66.67%)

9 (33.33%)

 

 No

120 (81.63%)

87 (72.50%)

33 (27.50)

 

Diabetes mellitus

   

0.120a

 Yes

10 (6.80%)

5 (50.00%)

5 (50.00%)

 

 No

137 (93.20%)

100 (72.99%)

37 (27.01%)

 

BMI (kg/m2)

24.39 (26.82–22.20; 4.62)

24.49 (27.12–22.67; 4.44)

23.66 (24.93–21.67; 3.26)

0.139d

History of surgery

   

0.088a

 Yes

29 (19.73%)

17 (58.62%)

12 (41.38%)

 

 No

118 (80.27%)

88 (74.58%)

30 (25.42%)

 

Laterality

   

0.085a

 Left

78 (53.06%)

51 (65.38%)

27 (34.62%)

 

 Right

69 (46.94%)

54 (78.26%)

15 (21.74%)

 

RIPA (°)

38.40 ± 23.03

43.70 ± 22.52

25.15 ± 18.75

< 0.001c*

Inferior pole stone

   

< 0.001b*

 Yes

91 (61.90%)

53 (58.24%)

38 (41.76%)

 

 No

56 (38.10%)

52 (92.86%)

4 (7.14%)

 

RIL (mm)

24.72 (27.31–20.95; 6.36)

24.00 (26.07–20.09; 5.98)

26.47 (28.05–23.39; 4.66)

0.005d*

RIW (mm)

8.15 (10.86–6.47; 4.39)

8.56 (10.70–6.52; 4.18)

7.48 (11.47–6.16; 5.31)

0.839d*

Stone burden (mm)

13.21(20.00–10.00;10.00)

12.21 (17.36–9.84; 7.52)

15.93 (25.00 –10.75;14.25)

0.003d*

Number of stone

   

0.352a

 Single

106 (72.11%)

78 (73.58%)

28 (26.42%)

 

 Multiple

41 (27.89%)

27 (65.85%)

14 (34.15%)

 

Renal stone density (Hu)

1403.19 ± 281.40

1330.59 ± 255.41

1584.69 ± 263.16

< 0.001c*

Urine culture

   

0.762a

 Positive

36 (24.49%)

25 (69.44%)

11 (30.56%)

 

 Negative

111 (75.51%)

80 (72.07%)

31 (27.93%)

 

R.I.R.S. score

7.39 ± 1.31

7.07 ± 1.18

8.19 ± 1.29

< 0.001d*

  1. BMI Body mass index, RIPA renal infundibulopelvic angle, RIL renal infundibulopelvic length, RIW renal infundibular width
  2. *Statistical significance was set at P < 0.05
  3. aChi-square test
  4. bFisher's exact test
  5. cStudent's t test
  6. dMann-Whitney U test