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Table 1 Characteristics of all patients

From: Postoperative radiotherapy with or without concurrent chemotherapy for oral squamous cell carcinoma in patients with three or more minor risk factors: a propensity score matching analysis

Characteristic Frequency in the CCRT group (%) Frequency in the RT group (%) p-value (2-sided)
Sex
 Male 28 (82.4%) 32 (94.1%) 0.259
 Female 6 (17.6%) 2 (5.9%)  
ECOG performance
 0–1 33 (97.1%) 32 (94.1%) 1
 2 1 (2.9%) 2 (5.9%)  
Age
 < 40 years 2 (5.9%) 1 (2.9%) 1
 40 years 32 (94.1%) 33 (97.1%)  
Other comorbidities
 No 19 (55.9%) 26 (76.5%) 0.123
 Yes 15 (44.1%) 8 (23.5%)  
Smoking
 Yes 27 (79.4%) 29 (85.3%) 0.752
 No 7 (20.6%) 5 (24.6%)  
Alcohol
 Yes 25 (73.5%) 27 (79.4%) 0.776
 No 9 (26.5%) 7 (20.6%)  
Betel quid
 Yes 21 (61.8%) 26 (76.5%) 0.294
 No 13 (38.2%) 8 (23.5%)  
Anemia
 Yes 10 (29.4%) 10 (29.4%) 1.000
 No 24 (70.6%) 24 (70.6%)  
Sitea
 Tongue 9 (26.5%) 7 (20.6%) 0.738
 Mouth floor 1 (2.9%) 1 (2.9%)  
 Buccal mucosa 12 (35.3) 14 (41.2%)  
 Gums 8 (23.5%) 7 (20.6%)  
 Hard palate 1 (2.9%) 0  
 Retromolar trigone 3 (8.8) 5 (14.7%)  
Differentiation
 Other 30 (88.2%) 28 (82.4%) 0.734
 Poor 4 (11.8%) 6 (17.6%)  
Pathologic T stage
 T1–3 13 (38.2%) 12 (35.3%) 1
 T4 21 (61.8%) 22 (64.7%)  
Pathologic N stage
 N0 16 (47.1%) 25 (73.5%) 0.046
 N1 18 (52.9%) 9 (26.5%)  
Margin distance
 < 5 mm 19 (55.9%) 24 (70.6%) 0.314
 ≥ 5 mm 15 (44.1%) 10 (29.4%)  
Skin invasion
 Yes 6 (17.6%) 9 (26.5%) 0.56
 No 28 (82.4%) 25 (73.5%)  
Bone invasion
 Yes 14 (41.2%) 16 (47.1%) 0.807
 No 20 (58.8%) 18 (52.9%)  
Perineural invasion
 Yes 21 (61.8%) 22 (64.7%) 1
 No 13 (38.2%) 12 (35.3%)  
Vascular invasion
 Yes 4 (11.8%) 1 (2.9%) 0.356
 No 30 (88.2%) 33 (97.1%)  
Lymphatic invasion
 Yes 1 (2.9%) 1 (2.9%) 1
 No 33 (97.1%) 33 (97.1%)  
Invasion depth of tumor
 < 10 mm 5 (24.6%) 2 (5.9%) 0.427
 ≥ 10 29 (75.4%) 32 (94.1%)  
  1. aSum was not 100% due to rounding
  2. Abbreviations: RT radiotherapy, CCRT concurrent chemoradiation