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Table 4 Univariate and multivariate predictors of SSI in patients after spinal surgeries

From: Association between intraoperative computed tomography navigation system and incidence of surgical site infection in patients with spinal surgeries: a retrospective analysis

Variables

Patients with SSI (n = 21)

Patients without SSI (n = 491)

P valueb

Multivariate analysis*

OR

95% CI

P value

Age, years

66.00 (54.00–75.50)

64.00 (46.00–73.00)

0.482

1.018

0.987–1.051

0.260

Female sex

10

260

0.661

0.987

0.381–2.559

0.979

BMIa, kg/m2

25.00 (21.72–30.23)

23.70 (27.70–27.10)

0.373

1.042

0.947–1.145

0.400

Obesity,

10

200

0.651

Hypertension, N (%)

7

170

1.000

Diabetes, N (%)

3

99

0.780

Hyperlipidemia

1

27

1.000

Chronic renal failure

1

24

1.000

Steroid use

3

15

0.033#

3.104

0.677–14.227

0.145

Smoking

0

27

0.618

ASA-PS ≥ 3

11

139

0.026#

1.878

0.702–5.025

0.209

JOA scorea

11.50 (7.00–13.50)

13.20 (11.00–16.00)

0.041*

0.878

0.779–0.990

0.034

C-arm use

4

52

0.271

0.921

0.107–7.921

0.940

O-arm use

10

204

0.654

0.631

0.102–3.886

0.619

Both use

3

33

0.177

0.628

0.064–6.136

0.619

Instrumentation

16

211

0.003#

6.241

1.113–34.985

0.037

Number of surgical levelsa

4.00 (2.00–5.00)

4.00 (2.00–5.00)

0.274

Duration of Surgery, min

266.00 (186.50–367.50)

217.00 (154.25–321.75)

0.123

Blood loss, ml

330.00 (90.00–725.00)

150.00 (50.00–400.00)

0.260

  1. SSI, surgical site infection; OR, odds ratio; BMI, body mass index; ASA-PS, American Society of Anesthesiologists Physical Status; JOA, Japanese Orthopaedic Association. a Values are presented as median value and interquartile (IQR). bSignificant differences (P < .05) between values for patients with SSI and without SSI were calculated by *Mann–Whitney U or #Chi-square test