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Table 2 The prognostic factors in the COX model

From: Regional metastasis to anatomies beyond traditional neck dissection boundaries: a multi-institutional analysis focused on unconventional metastases in oral cancer patients

Variables COX
OR(95%CI) Wald P value
Primary or recurrent sitea   15.113 0.035
 Buccal mucosa
 Upper gingiva
 Lower gingiva
 Floor of mouth
 Retromolar trigone
 Hard palate
Unconventional metastatic subsitesa   7.103 0.029
Pathological grade NA NA 0.23
Lymph nodes size of UMLNs NA NA 0.432
 0–3 cm
 > 3 cm
Extranodal extension (ENE) in UMLNs 1.17-10.19 5.004 0.025
Contralateral metastasis NA NA 0.076
Concurrent with cervical lymph node metastases NA NA 0.407
Extranodal extension (ENE) in cervical lymph nodes 1.23-6.81 5.909 0.015
Neck dissectiona   11.163 0.025
Postoperative adjuvant therapiesa   NA 0.863
  1. NA not available
  2. -2 Log likelihood = 358.102(P < 0.001)
  3. aDummy variable was introduced when analyzing these factors