Table 3 Regression analyses of risk factors for temporary facial weakness after parotidectomy

Gender

M vs. F (ref)

1.278

0.787

2.076

0.322

Age

Continuous

1.019

1.002

1.036

0.032

1.019

1.001

1.037

0.035

Pathology

Malignancy vs. benign (ref)

4.013

2.420

6.656

< 0.0001

3.472

2.018

5.974

< 0.0001

Tumor size

Continuous

1.282

1.086

1.514

0.0033

0.139

0.949

1.368

0.162

Number of tumors

Multiple vs. single (ref)

2.137

0.857

5.331

0.103

1.539

0.534

4.437

0.424

Tumor subsite

Superficial (ref)

1

1

vs. deep

2.929

1.465

5.856

0.002

2.202

1.052

4.608

0.036

vs. both

6.018

3.159

11.465

< 0.0001

3.335

1.600

6.950

0.001

Extent of surgery

ECD (ref)

1

vs. partial

2.675

0.625

11.444

0.185

vs. superficial

2.839

0.625

12.889

0.176

vs. total parotidectomy

18.678

4.283

81.455

< 0.0001

Type of surgery (recurrent tumors)

Revision vs. primary surgery (ref)

4.087

1.953

8.549

0.0002

3.222

1.285

8.076

0.013