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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
 Tongue
 Retromolar trigone
 Lip
 Hard palate
Unconventional metastatic subsitesa   7.103 0.029
 Buccinator
 Sublingual
 Parotid
Pathological grade NA NA 0.23
 I
 II
 III
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
 Yes
 No
Contralateral metastasis NA NA 0.076
 Yes
 No
Concurrent with cervical lymph node metastases NA NA 0.407
 Yes
 No
Extranodal extension (ENE) in cervical lymph nodes 1.23-6.81 5.909 0.015
 Yes
 No
Neck dissectiona   11.163 0.025
 ISND
 IRND
 CND
 BND
 None
Postoperative adjuvant therapiesa   NA 0.863
 Radiotherapy
 Chemotherapy
 Radio-chemotherapies
 None
  1. NA not available
  2. -2 Log likelihood = 358.102(P < 0.001)
  3. aDummy variable was introduced when analyzing these factors