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Table 2 Prognostic index, risk groups and model fitting

From: Reporting performance of prognostic models in cancer: a review

  % (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)