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Table 1: 
Patient and tumor characteristics
CharacteristicsNo. of Patients%
Age (yr) (mean) (range)51 (33–80)
Sex
    Male3883
    Female817
Neck dissection procedure
    SOHND3372
    MRND1328
    Bilateral MRND12
Pathologic T stage
    T1–23372
    T3–41328
Pathologic N stage
    N03270
    N1–31430
Pathologic differentiation
    Well1533
    Moderate2759
    Poor49
Pathologic ECS
    Present1022
    Absent3678
Postoperative treatment
    RT715
    CCRT1839
  • Note:—SOHND indicates supraomohyoid neck dissection; MRND, modified radial neck dissection; ECS, extracapsular spread; RT, radiotherapy; CCRT, concurrent chemoradiotherapy.