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Table 2 Patient Characteristics

From: Grading of MRI–detected skull-base invasion in nasopharyngeal carcinoma with skull-base invasion after intensity-modulated radiotherapy

Characteristic LSBI group (N = 185) ESBI group (N = 284) P
Sex
 Male 113 (61.1) 209 (73.6) 0.004
 Female 72 (38.9) 75 (26.4)  
Age (year)
  < 48 99 (53.5) 127 (44.7) 0.062
  ≥ 48 86 (46.5) 157 (55.3)  
Pathology classification
 Keratinizing 2 (1.1) 2 (0.7) 0.664
 Non-keratinizing 183 (98.9) 282 (99.3)  
T classification
 T3 174 (94.1) 83 (29.2) < 0.001
 T4 11 (5.9) 201 (70.8)  
N classification
 N0 26 (14.1) 29 (10.2) 0.329
 N1 74 (40.0) 136 (47.9)  
 N2 61 (33.0) 87 (30.6)  
 N3 24 (13.0) 32 (11.3)  
Overall stage
 III 152 (82.2) 73 (25.7) < 0.001
 IVA 33 (17.8) 211 (74.3)  
Concurrent chemotherapy
 Yes 176 (95.1) 270 (95.1) 0.975
 No 9 (4.9) 14 (4.9)  
  1. ESBI extensive skull-base invasion, LSBI limited skull-base invasion