Table 1 Description of the clinical features of the patients included in the study.
Clinical features | Overall study cohort (n = 2509) | Data type | |
|---|---|---|---|
n | % | ||
Tumor stage | Nominal variable | ||
 0 | 24 | 1.0 | |
 1 | 630 | 25.1 | |
 2 | 979 | 39.0 | |
3 | 144 | 5.8 | |
 4 | 11 | 0.4 | |
 Unknown | 721 | 28.7 | |
Number of positive lymph nodes | Continuous variable | ||
 0—≤ 3 | 695 | 27.7 | |
  > 3—≤ 9 | 233 | 9.3 | |
  > 10 | 119 | 4.7 | |
 Unknown | 1462 | 58.3 | |
Nottingham prognostic index | |||
 1—≤ 2.4 | 219 | 8.7 | |
  > 1—≤ 3.4 | 555 | 22.1 | |
  > 3.4—≤ 5.4 | 1256 | 50.1 | |
  > 5.4 | 252 | 10.0 | |
 Unknown | 227 | 9.1 | |
 Follow-up months, median* | 116.47 ± 76.11 | Survival | |
Survival status | |||
 Alive (= 0) | 837 | 33.4 | |
 Death (= 1) | 1144 | 45.6 | |
 Unknown | 528 | 21.0 | |
