Table 3.
Regression analyses of risk factors for temporary facial weakness after parotidectomy
| Variables | Categories | Univariable | Multivariable | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Odds Ratio |
95% Confidence interval | P value | Odds Ratio |
95% Confidence interval | P value | ||||
| 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 |
Extent of surgery was significantly correlated with tumor pathology (P < 0.001) and tumor subsite (P < 0.001) by Pearson’s chi-square test. Thus, the extent of surgery variable was excluded in these multivariable analyses. ref reference, ECD extracapsular dissection of tumors