Table 1 Univariate Cox Regression analysis on factors for OSCC recurrence

Alpha domain

0.543

0.240

5.111

0.024

1.722 (1.075-2.758)

Alpha intensity

0.868

0.245

12.864

0.000

2.382 (1.472-3.854)

Alpha (D×I)

0.256

0.064

15.889

0.000

1.292 (1.139-1.466)

Alpha (categorical)

1.298

0.307

17.923

0.000

3.664 (2.008-6.683)

Smoking

1.210

0.326

13.812

0.000

3.354 (1.772-6.349)

Current smoking

0.940

0.362

6.754

0.009

2.560 (1.260-5.200)

Smoking dose

0.001

0.000

4.943

0.026

1.001 (1.000-1.002)

Differentiation (3 vs. 1)

1.567

0.367

18.230

0.000

4.792 (2.334-9.837)

T-stage (3 vs. 1)

1.848

0.551

11.250

0.001

6.349 (2.156-18.698)

Lymphatic metastasis

0.704

0.302

5.420

0.020

2.021 (1.118-3.656)

Clinical stage (3 vs. 1)

1.737

0.746

5.422

0.020

5.679 (1.316-24.501)

Clinical stage (4 vs. 1)

2.230

0.762

8.570

0.003

9.300 (2.090-41.387)