Table 1 Demographic and procedure baseline parameters stratified for PUL. Absolute and relative frequencies for categorical variables, and medians and quartiles for continuous sociodemographic variables are provided

Basic parameter

No. Patients

n = 248

n = 209 (84%)

n = 39 (16%)

p = 0.470^*

Age

[y]

53 (43–65)

50 (46–58)

p = 0.518^#

Sex

Male

n = 137 (55%)

n = 25 (10%)

p = 0.483^*

Female

n = 72 (29%)

n = 14 (6%)

BMI

[kg/m²]

27.4 (24.3–31.2)

30.7 (27.8–36.0)

p < 0.001^#

Max. Stone Size

[mm]

19 (14 – 26)

20 (14–33)

p = 0.443^#

PCNL History

No

n = 165 (67%)

n = 32 (13%)

p = 0.753^*

Yes

n = 43 (17%)

n = 7 (3%)

Procedure parameter

Duration PCNL

[min]

141 (111–171)

138 (117–166)

p = 1.000^#

Second look PCNL

n = 24

n = 21 (10%)

n = 3 (8%)

p = 0.454^*

Stone free

n = 202

n = 174 (83%)

n = 28 (72%)

p = 0.067^*

Time with NT

[d]

4 (3–5)

4 (3–7)

p = 0.064^#

No. Nephrostograms

1

139

20

p = 0.111^*

2

52

13

3

14

6

4

4

0

Cumulative radiation dose due to FN

cGy*cm²

47.3

(24.7–97.0)

134.6

(65.7–236.7)

p < 0.001^#

Renal pelvis pressure

[mmH₂O]

18 (15–21)

23 (20 – 29)

p < 0.001^#

Post-PCNL ureter stenting

n = 7

–

n = 7 (18%)

–