Table 1 Summary of patient characteristics
Characteristic | Overall n = 100 | Training n = 70 | Test n = 30 | P value | |
|---|---|---|---|---|---|
Gender | Female | 18 (18%) | 13 (16%) | 5 (17%) | 0.82 |
Male | 82 (82%) | 57 (84%) | 25 (83%) | ||
Age (years: mean ± SD) | 67.1 ± 9.40 | 67.7 ± 9.5 | 65.5 ± 9.2 | 0.40 | |
Histology | Larynx | 11 (11%) | 7 (10%) | 4 (13%) | 0.75 |
Oral cavity | 1 (1%) | 1 (1%) | 0 (0%) | ||
Mesopharynx | 32 (32%) | 21(30%) | 11 (37%) | ||
Hypopharynx | 56 (56%) | 41 (59%) | 15 (50%) | ||
Clinical stage | I | 7 (7%) | 4 (6%) | 3 (10%) | 0.76 |
II | 17 (17%) | 11 (16%) | 6 (20%) | ||
III | 21 (21%) | 16 (23%) | 5 (17%) | ||
IV | 55 (55%) | 39 (56%) | 16 (53%) | ||
Treatment method | Radiation only | 30 (30%) | 20 (29%) | 10 (33%) | 0.63 |
Chemo-radiation | 70 (70%) | 50 (71%) | 20 (67%) | ||
Brinkman index (mean ± SD) | 747.9 ± 503.7 (unknown: n = 7) | 733.7 ± 560.1 (unknown: n = 4) | 781.1 ± 343.7 (unknown: n = 3) | 0.49 | |
Tumor volume (cm3: mean ± SD) | 19.5 ± 31.5 | 19.5 ± 35.2 | 19.4 ± 21.0 | 0.25 | |
Follow-up (Month: median) | 33 | 37 | 32 | 0.77 | |