Table 1 Comparison of preoperative demographics of patients.

From: Analysis of postoperative infection factors of retrograde intrarenal surgery combined with negative pressure equipment for renal stones

Variables

Groups

p value

Non-infectious

Infectious

Number

330

12

-

Gender (male/female)

128/202

6/6

0.434

Age (years)

52.81 ± 11.33

52.67 ± 11.06

0.910

BMI (kg/m2)

23.02 ± 3.47

23.17 ± 3.57

0.883

ASA score

 

0.289

 0

227

8

 1–2

97

3

 3–4

6

1

DM

32

2

0.428

Urine cultures (positive/negative)

47/283

1/11

0.563

Hydronephrosis grade

 

0.343

 No

174

8

 Mild

107

1

 Middle

33

2

 Sever

16

1

Renal abnormality

14

1

0.497

Stone size (mm)

16(13,21)

22(19,24)

< 0.001

Stone site (left/right)

124/206

5/7

0.774

Stone ___location

 

0.190

 Upper pole

30

1

 Middle pole

103

1

 Lower pole

23

2

 Pelvis

32

0

 Multiple

142

8

Stones density (HU)

764(570,1012)

1372(841,1527)

< 0.001

Pre-op JJ stent

26

2

0.275

Previous stone treatment

 

0.229

 SWL

28

1

 PCNL/URS

23

2

 Open surgery

10

0

  1. BMI body mass index, ASA score American Society of Anaesthesiologists Score, DM diabetes mellitus, HU Hounsfield Unite, URS Ureterorenoscopy, SWL shock wave lithotripsy, PCNL percutaneous nephrolithotomy.
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