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Table 3 Univariate Analysis using Cox-Regression Analysis

From: Surgical site infections following oral cavity cancer resection and reconstruction is a risk factor for plate exposure

Variable

Proportion of post-op exposure

Hazard ratio

95% CI

P-Value

Exposure

No exposure

 Age

 <60 years

15 (4.1%)

145 (39.7%)

1.43

0.75 – 2.74

0.274

 >60 years

24 (6.6%)

181 (49.6%)

   

Sex

 male

27 (7.4%)

199 (54.5%)

0.674

0.341 – 1.331

0.255

 female

12 (3.3%)

127 (34.8%)

   

T2DM

 yes

4 (1.1%)

35 (9.6%)

1.051

0.373 – 2.957

0.925

 no

35 (9.6%)

290 (79.5%)

   

 missing

 

1 (0.2%)

   

Smoking

 active smoker

11 (3.0%)

91 (24.9%)

0.986

0.668 – 1.456

0.943

 ex-smoker

12 (3.2%)

99 (27.1%)

   

 non-smoker

15 (4.1%)

119 (32.6%)

   

 missing

1 (0.2%)

17 (4.9%)

   

Adj radiotherapy

 yes

28 (7.7%)

205 (56.2%)

1.461

0.727 – 2.940

0.287

 no

11 (3.0%)

121 (33.1%)

   

Use of rescue screw

 yes

14 (35.9%)

62 (19.0%)

1.132

0.849 – 1.510

0.398

 no

24 (61.5%)

210 (64.4%)

   

 missing

1 (2.6%)

54 (16.6%)

   

Use of locking screw

 yes

10 (25.6%)

52 (16.0%)

1.06

0.731 – 1.528

0.767

 no

28 (71.8%)

219 (67.2%)

   

 missing

1 (2.6%)

55 (16.9%)

   

Segmental Mandibulectomy

 yes

30 (76.9%)

182 (55.8%)

2.556

1.212 – 5.391

0.014

 no

9 (23.1%)

140 (43.0%)

   

 missing

 

4 (1.2%)

   

Adverse Soft Tissue

 yes

20 (51.3%)

159 (48.8%)

1.312

0.671 – 2.565

0.427

 no

15 (38.5%)

165 (50.6%)

   

 missing

4 (10.2%)

2 (0.6%)

   

Plate Height

 10 mm

3 (7.7%)

7 (2.1%)

1.436

1.131 – 1.824

0.003

 15 mm

25 (64.1%)

236 (72.4%)

   

 20 mm

1 (2.6%)

5 (1.5%)

   

 24 mm

3 (7.7%)

12 (3.7%)

   

 28 mm

6 (15.3%)

8 (2.5%)

   

 missing

1 (2.6%)

58 (17.8%)

   

Post-op Infection

 yes

21 (5.8%)

63 (17.2%)

5.72

3.04 – 10.80

<0.001

 no

18 (4.9%)

263(72.1%)

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