Table 1 Patients’ baseline characteristics

Age (year)^†

57.57 ± 10.73

57.13 ± 11.30

57.75 ± 10.58

0.835

Sex (Male)

34/42

15/16

19/26

0.102

BMI (kg/m²)^†

25.37 ± 3.19

25.17 ± 2.73

25.49 ± 3.49

0.897

HTN^‡

24/42

10/16

14/26

0.411

DM

9/42

4/16

5/26

0.471

Gout

0/42

0/16

0/26

NA

Hypercalcemia

3/42

0/16

3/26

NA

Laterality (Right)^‡

24/42

11/16

13/26

0.192

Level of ureter

0.951

 Upper

32

12

20

 Middle

3

1

2

 Lower

7

3

4

HU^†

1138.74 ± 349.39

1200.19 ± 321.78

1100.92 ± 366.29

0.534

Stone size (mm)^†

11.10 ± 4.05

12.47 ± 4.30

10.26 ± 3.73

0.150

Stone surface^‡

 Rough or spiculated

28/42

10/16

18/26

0.452

Hydronephrosis^‡,*

 Moderate to severe

19/42

8/16

11/26

0.433

Number of Polyps

 5 or more

15/42

7/16

8/26

0.511

 F/U CT

35/42

14/16

21/26

0.454

 F/U URS^‡

20/42

9/16

11/26

0.365

Stone analysis

 Calcium Oxalate

41/42

15/16

26/26

NA

 Calcium Phosphate

3/42

1/16

2/26

NA

 Uric acid

1/42

1/16

0/26

NA

 Struvite (mixed) ^‡

15/42

6/16

9/26

0.452

 Others

0/42

0/16

0/26

NA