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Table 2 Comparison between patients with stone impaction and patients without stone impaction stratified according to stone size regarding the clinical and outcome parameters

From: Value of preoperative ureteral wall thickness in prediction of impaction of ureteric stones stratified by size in laser ureteroscopic lithotripsy

 

Size ≤ 10 mm

n = 60

p

Size > 10 mm

n = 94

p

Impacted

n = 16

Not impacted

n = 44

Impacted

n = 58

Not impacted

n = 36

Age (years) mean ± SD

33.9 ± 3.1

34.1 ± 7.2

0.93

40.4 ± 9.2

37.5 ± 9.4

0.1

Male/female n

7/9

27/17

0.33

32/26

20/16

0.69

BMI (kg/m2)

29.7 ± 3.6

29.5 ± 3.7

0.78

29.8 ± 3.1

29.7 ± 3.6

0.81

Previous URSL n (%)

4 (25)

12 (26.1)

0.8

21 (36.2)

10 (27.8)

0.31

Duration of symptoms (days) median (range)

38 (13.0–146.0)

21 (16.0–145.0)

0.21

29.0 (13.0–152.0)

24.0 (13.0–148.0)

0.11

ECOG performance status n (%)

< 2

10 (62.5)

37 (84.1)

0.21

48 (82.8)

30 (83.3)

0.44

≥ 2

6 (37.5)

7 (15.9)

 

10 (17.2)

6 (16.7)

 

Radiological findings

Hydronephrosis n (%)

13 (81.3)

36 (81.8)

0.93

56 (95.6)

29 (80.6)

0.04

Hydronephrosis grade n (%)

 Mild

9 (56.3)

36 (81.8)

0.05

40 (68.9)

23 (63.9)

0.09

 Moderate

4 (25)

1 (2.3)

 

16 (27.6)

5 (13.9)

 

PAPD (mm) mean ± SD

27.9 ± 10

23.4 ± 5.2

0.08

28.6 ± 8.2

25.1 ± 6.3

0.09

PUD (mm) mean ± SD

11.9 ± 2.8

9.6 ± 3.9

0.04

13.2 ± 3.4

11.1 ± 4.1

0.03

UWT (mm) mean ± SD

5 ± 1.6

3.6 ± 1.4

0.005

3.7 ± 1.6

2 ± 1.4

< 0.001

Stone characteristics

Size (mm) mean ± SD

8.9 ± 1.4

8.5 ± 1.3

0.64

14.7 ± 2.2

13.5 ± 3.7

0.47

Side (right/left) n

9/6

25/14

0.23

26/33

22/19

0.1

Number (n) mean ± SD

1.1 ± 0.1

1 ± 0.4

0.31

1.33 ± 0.7

1.0 ± 0.3

0.01

Site n (%)

 Upper

5 (31.3)

13 (29.6)

0.2

25 (43.1)

15 (41.7)

0.01

 Middle

1 (6.3)

10 (22.7)

 

2 (3.4)

11 (20.6)

 

 Lower

11 (68.8)

21 (47.7)

 

30 (71.4)

10 (27.8)

 

Density (HU)

368.7 ± 132.6

409.5 ± 129.1

0.17

499.7 ± 179.5

501 ± 177

0.93

Endoscopic findings n (%)

Ureteral edema

8 (50)

39 (88.6)

0.1

42 (72.4)

25 (69.4)

0.21

Ureteral polyp

2 (12.5)

2 (4.6)

 

21 (36.2)

8 (22.2)

 

White patch

-

-

 

1 (2.4)

6 (11.5)

 

Operative Time(min) mean ± SD

46 ± 1.4

27.9 ± 1.3

0.03

55 ± 1.2

35 ± 1.6

0.04

Lasering time(min) mean ± SD

27.2 ± 2

13.9 ± 1.1

0.04

33 ± 1.6

17 ± 1.8

0.03

  1. BMI body mass index, ECOG Eastern Cooperative Oncology Group, PAPD pelvic anteroposterior diameter, PUD proximal ureteric diameter, URSL ureteroscopic lithotripsy, UWT ureteral wall thickness, HU hounsfield unit