Table 1 Patient general characteristics and tumor staging
General characteristics | With thyroid cartilage invasion | Without thyroid cartilage invasion | P Value |
|---|---|---|---|
Number | 86 | 179 | Â |
Age(mean ± SD, years) | 59.7 ± 10.5 | 59.3 ± 9.4 | 0.263a |
Gender | |||
 male | 80 (93.0%) | 173 (3.4%) | 0.184b |
 female | 6 (7.0%) | 6 (2.8%) | |
Primary site | |||
 Supraglottis | 30 (34.9%) | 82 (45.8%) | 0.029b |
 Glottis | 49 (57.0%) | 69 (38.5%) | |
 Subglottis | 1 (1.1%) | 8 (4.5%) | |
 Hypopharynx | 6 (7.0%) | 20 (11.2%) | |
T stage | |||
 T1 | 0 (0) | 25 (14.0%) | < 0.001b |
 T2 | 0 (0) | 67 (37.4%) | |
 T3 | 44 (51.2%) | 87 (48.6%) | |
 T4 | 42 (48.8%) | 0 (0) | |
N stage | |||
 N0 | 60 (69.7%) | 117 (65.4%) | 0.717b |
 N1 | 14 (16.3%) | 28 (15.6%) | |
 N2 | 12 (14.0%) | 33 (18.4%) | |
 N3 | 0 (0) | 1 (0.6%) | |