Table 1 Baseline clinical characteristics of patients
Characteristics | All cases (n = 163) | Training set (n = 80) | Testing set (n = 83) |
|---|---|---|---|
Age (years) | |||
 median | 65 | 66 | 65 |
 range | 39–90 | 39–90 | 44–84 |
Sex | |||
 Male | 127 (77.9) | 58 | 69 |
 Female | 36 (22.1) | 22 | 14 |
Smoking history | |||
 Yes | 92 (56.4) | 41 | 51 |
 No | 71 (43.6) | 39 | 32 |
Drinking history | |||
 Yes | 86 (56.4) | 41 | 45 |
 No | 77 (43.6) | 39 | 38 |
T stage | |||
 1–3 | 128 (78.5) | 63 | 65 |
 4 | 35 (21.5) | 17 | 18 |
N stage | |||
 0 | 137 (84.0) | 63 | 74 |
 1–3 | 26 (16.0) | 17 | 9 |
Tumor stage | |||
 II | 41 (25.2) | 20 | 21 |
 III | 122 (74.8) | 60 | 62 |
Tumor location | |||
 Cervical | 12 (7.4) | 5 | 7 |
 Upper thoracic | 50 (30.7) | 27 | 23 |
 Mid-thoracic | 75 (46.0) | 36 | 39 |
 Lower thoracic | 26 (16.0) | 12 | 14 |
Tumor response | |||
 OR | 112 (68.7) | 56 | 56 |
 Non-OR | 51 (31.3) | 24 | 27 |