Table 2 Prognostic index, risk groups and model fitting
From: Reporting performance of prognostic models in cancer: a review
| Â | % (n) articles |
|---|---|
Prognostic index (PI) developed | 81 (38) |
   Components of final model used to create PI |  |
Same variables and coefficients | 34 (13/38) |
Same variables but not same coefficients | 21 (8/38) |
Neither same variables nor coefficients | 29 (11/38) |
Method unclear | 16 (6/38) |
Risk groups are created from prognostic model | 76 (36) |
   Method used to create risk groups |  |
Data driven | 28 (10/36) |
Equal size groups created | 14 (5/36) |
Other non data driven method | 11 (4/36) |
Method unclear | 8 (3/36) |
Method not reported | 39 (14/36) |
   Number of risk groups created |  |
Two risk groups | 11 (4/36) |
Three risk groups | 39 (14/36) |
Four risk groups | 31 (11/36) |
Five or more groups | 11 (4/36) |
Several different risk groupings used | 8 (3/36) |