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Table 3 Univariate and multivariate regression analysis for risk factors of SSI in the training cohort

From: Development and validation of a nomogram to predict the risk of surgical site infection within 1 month after transforaminal lumbar interbody fusion

Factors

Univariable analysis

Multivariable analysis

β

OR

95% CI

P value

β

OR

95% CI

P value

Age (years)

0.04

1.04

0.99–1.09

0.115

   

NI

BMI (kg/m2)

0.04

1.04

0.92–1.17

0.551

   

NI

Height (mm)

0.01

1.01

0.96–1.06

0.710

   

NI

Weight (kg)

0.02

1.02

0.98–1.06

0.434

   

NI

The total volume of drainage (mL)

0.01

1.00

0.99–1.00

0.727

   

NI

The last volume of drainage (mL)

0.02

1.02

1.00–1.04

0.074

   

NI

The duration of drainage (days)

− 0.23

0.79

0.55–1.13

0.198

   

NI

Lengths of admission (days)

0.02

1.02

0.93–1.11

0.586

   

NI

Albumin (g/L)

− 0.02

0.98

0.88–1.11

0.786

   

NI

The last CRP (mg/L)

0.01

1.00

0.98–1.02

0.959

   

NI

The highest WBC count (109/L)

0.04

1.04

0.93–1.16

0.455

   

NI

The last WBC count (109/L)

− 0.01

1.00

0.87–1.13

0.986

   

NI

The highest ESR count (mm/h)

0.02

1.02

1.00–1.03

0.069

   

NI

The last ESR count (mm/h)

0.01

1.01

0.99–1.03

0.392

   

NI

Gender

       

NI

Female

Ref

Ref

Ref

Ref

    

Male

0.45

1.57

0.72–3.57

0.259

    

Drinking

       

NI

No

Ref

Ref

Ref

Ref

    

Yes

0.36

1.43

0.50–3.53

0.467

    

Smoking

       

NI

No

Ref

Ref

Ref

Ref

    

Yes

0.79

2.20

0.90–5.03

0.070

    

> 7

− 0.31

0.74

0.17–2.30

0.637

    

The highest CRP (mg/L)

0.01

1.01

1.00–1.02

0.025*

0.01

1.01

0.99–1.03

0.147

Subcutaneous fat thickness (mm)

0.09

1.09

1.03–1.16

0.005*

0.07

1.07

0.97–1.17

0.157

LPM fat infiltration (%)

0.08

1.08

1.05–1.12

< 0.001*

0.08

1.08

1.03–1.14

0.002*

Diabetes

        

No

Ref

Ref

Ref

Ref

    

Yes

1.53

4.60

2.10–10.38

< 0.001*

1.19

3.27

1.05–10.74

0.04*

UTIs

        

No

Ref

Ref

Ref

Ref

    

Yes

0.99

2.70

1.05–6.42

0.029*

0.81

2.25

0.61–8.17

0.214

Occupation

        

Sedentary occupation

Ref

Ref

Ref

Ref

    

Physical work

− 2.78

0.06

0.01–0.42

0.0043*

− 1.95

0.14

0.01–2.72

0.208

Others

− 2.64

0.07

0.01–0.46

0.0054*

− 1.80

0.17

0.01–2.92

0.235

Surgery duration (h)

        

< 3

Ref

Ref

Ref

Ref

    

3–4

2.28

9.74

1.79–181.01

0.03*

2.39

10.88

1.63–222.75

0.037*

≥ 4

4.32

75.37

14.74– > 1000

< 0.001*

5.06

157.34

24.05– > 1000

< 0.001*

  1. β regression coefficient; OR odds ratio; 95% CI 95% confidence interval; NI not included; and Ref reference
  2. *P < 0.05
  3. *Statistically significant
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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X