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Table 1 Demographic and clinical characteristics of the oral and oropharyngeal cancer patients, n = 1765

From: Postoperative radiotherapy is associated with improved survival in pT1-2N1 oral and oropharyngeal cancer without adequate neck dissection

Variable Total 18 < LNs 18 LNs < 25 25 LNs P value
n = 1765 n = 598 n = 289 n = 878
RT 1067 (60.5) 354 (59.2) 184 (63.7) 529 (60.3) 0.436
Gender
Female 624 (35.4) 230 (38.5) 100 (34.6) 294 (33.5) 0.139
Male 1141 (64.6) 368 (61.5) 189 (65.4) 584 (66.5)  
Age, years (Mean ± SD) 60.9 ± 12.4 62.8 ± 12.6 60.7 ± 11.9 59.7 ± 12.2  < 0.001
Pathological T classification
T1 883 (50.0) 332 (55.5) 138 (47.8) 413 (47) 0.004
T2 882 (50.0) 266 (44.5) 151 (52.2) 465 (53)  
Differentiation
Well 166 (9.4) 65 (10.9) 21 (7.3) 80 (9.1) 0.095
Moderately 1021 (57.8) 329 (55) 186 (64.4) 506 (57.6)  
Poorly 578 (32.7) 204 (34.1) 82 (28.4) 292 (33.3)  
Site
Oral cavity 1108 (62.8) 360 (60.2) 185 (64) 563 (64.1) 0.277
Oropharynx 657 (37.2) 238 (39.8) 104 (36) 315 (35.9)  
  1. LNs lymph nodes, RT radiotherapy