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Table 1 Patient characteristics

From: Results of a randomized controlled trial of level IIb preserving neck dissection in clinically node-negative squamous carcinoma of the oral cavity

Variable Sub group 2b sparing Control P value
Gender Male 10 18 0.6
Female 2 2
Primary site Buccal mucosa 8 10 0.15
Lower alveolus 0 6
tongue 4 4
Premalignant lesion Leukoplakia 4 4 0.43
Habits Tobacco chewing 8 17 0.16
Chewing + smoking 2 3
Clinical T stage cT2 9 12 0.301
cT3 2 2
cT4 0 5
cTx 1 1
TNM stage I 1 1 0.234
II 8 12
III 3 2
IV 0 5
Surgery for primary WLE 12 20  
Bone resection Hemi mandibulectomy 0 7 0.08
Marginal mandibulectomy 0 1
Segmental mandibulectomy 0 2
Upper alveolectomy 1 0
Reconstruction Nasolabial 1 4 0.5
Sternomastoid 2 2
SSG 3 2
Neck dissection I–III 11 19  
I–V 1 1
Pathological T pT1 5 5 0.45
pT2 4 7
pT3 1 1
pT4 1 6
pTx 1 1
Margin Close 3 4 0.5
Negative 6 10
Positive 3 6
Lymphovascular invasion Present 2 7 0.263
Perineural invasion Present 0 4 0.12
Radiotherapy Yes 2 11 0.05
Chemotherapy Yes 3 3 0.6
Recurrences Yes 1 2 0.6