Table 1: Demographic, prognostic factors of the sample.

FactorsTotal sample
Close margin
(group 1)
Clear margin
(group 2)

Site
 Tongue724032
  Buccal mucosa28244
 Gingiva440
Tobacco use
 No442816
 Yes604020
PORT
 No523319
 Yes523517
HPE diagnosis
 WDSCC734429
 MDSCC31247
Lymphovascular spread
 Absent1036736
 Present110
Perineural invasion
 Absent1006535
 Present431
T stage
 T1543024
 T2503812