From: External validation of a Cox prognostic model: principles and methods
Risk group | t | Kaplan-Meier | Predicted | |||||||
---|---|---|---|---|---|---|---|---|---|---|
 | (yr) | Derivation | Validation | Validation | ||||||
 |  | N | Ev. |
| SE | N | Ev. |
| SE |
|
1. Good | 2 | 247 | 90 | 0.90 | 0.02 | 124 | 28 | 0.88 | 0.03 | 0.88 |
 | 5 |  |  | 0.71 | 0.03 |  |  | 0.68 | 0.05 | 0.73 |
2. Fairly good | 2 | 526 | 270 | 0.82 | 0.02 | 277 | 103 | 0.85 | 0.02 | 0.78 |
 | 5 |  |  | 0.56 | 0.02 |  |  | 0.59 | 0.03 | 0.54 |
3. Fairly poor | 2 | 526 | 401 | 0.60 | 0.02 | 225 | 123 | 0.61 | 0.03 | 0.63 |
 | 5 |  |  | 0.31 | 0.02 |  |  | 0.37 | 0.04 | 0.32 |
4. Poor | 2 | 247 | 204 | 0.44 | 0.03 | 60 | 45 | 0.53 | 0.07 | 0.47 |
 | 5 |  |  | 0.20 | 0.03 |  |  | 0.11 | 0.05 | 0.16 |