| Median survival (month) | P value | Median survival (month) | P value |
Age | ||||
  < 55 years old | 10.0 |  | 18.6 |  |
  ≥ 55 years old | 18.5 | 0.046 | 34.8 | 0.002 |
Sex | ||||
 Male | 15.6 |  | 28.8 |  |
 Female | 10.5 | 0.778 | 21.0 | 0.599 |
TMN staging | ||||
 I and II | 30.2 |  | 45.5 |  |
 III and IV | 7.7 | < 0.001 | 15.7 | < 0.001 |
T classification | ||||
 I | 15.4 |  | 23.5 |  |
 II | 10.4 |  | 40.2 |  |
 III | 16.2 |  | 24.2 |  |
 IV | 4.0 | 0.061 | Not reached | 0.948 |
Lymph node metastasis | ||||
 N0 | 21.2 |  | 40.2 |  |
 N1 | 6.1 | < 0.001 | 11.5 | < 0.001 |
Tumor differentiation | ||||
 Well | 51.7 |  | Not reached |  |
 Moderate | 15.6 |  | 28.8 |  |
 Poor | 6.7 | 0.003 | 19.4 | 0.027 |
Resection Margin | ||||
 Positive | 4.8 |  | 21.0 |  |
 Negative | 15.6 | 0.020 | 25.2 | 0.304 |
Tumor size | ||||
  < 5 cm | 19.8 |  | 28.8 |  |
  ≥ 5 cm | 6.7 | 0.001 | 21.5 | 0.071 |
Hepatitis | Â | Â | Â | Â |
  Positive | 10.4 |  | 19.0 |  |
 Negative | 17.6 | 0.005 | 25.2 | 0.079 |
Hypertension | ||||
 Yes | 11.7 |  | 21.1 |  |
 No | 15.6 | 0.856 | 43.0 | 0.074 |
Bile duct stone | ||||
 Yes | 11.7 |  | 18.6 |  |
 No | 15.6 | 0.657 | 30.4 | 0.063 |
Jaundice | ||||
 Yes | 10.2 |  | 19.4 |  |
 No | 15.4 | 0.406 | 25.2 | 0.386 |
Fever | ||||
 Yes | 10.5 |  | 21.1 |  |
 No | 15.4 | 0.737 | 24.8 | 0.920 |
Postoperative chemotherapy | ||||
 Yes | 11.7 |  | 43.0 |  |
 No | 15.6 | 0.939 | 23.5 | 0.170 |
CA-199 | ||||
 Elevated | 15.4 |  | 26.0 |  |
 Not elevated | 11.7 | 0.961 | 28.8 | 0.887 |
CEA | ||||
 Elevated | 7.7 |  | 15.5 |  |
 Not elevated | 17.6 | 0.183 | 40.2 | 0.016 |