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Table 3 Model performance on data used to develop model and usability* (n = 42)

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

  Articles with risk groups (n = 36) Articles with PI but no risk groups (n = 6**)
Presentation of discrimination of model predictions†   
   KM for risk groups 34 NA
   Nomogram 2 4
   Other graphical 2 2
   % survival probability at fixed time†† 22 0
   Index of discrimination (see below) 9 2
   Log rank 17 NA
   Unspecified P-value 6 0
No presentation 0 0
Index of discrimination$   
   c-index 7 1
   R squared or goodness of fit or Brier score 1 1
   D 0 0
   Other - K (Begg), sensitivity and specificity 2 0
   Reclassification of patient risk 0 0
Calibration   
   Yes 1 1
   No 35 5
Model usability from article$$   
   Prognostic score or risk group can be assigned 33 6
   Survival presented for risk group and/or prognostic score 36 5
   Instructions for use suitable for physicians included 3 3
  1. * Five articles did not develop PI or use risk groups.
  2. **Four of six articles had some commonality: three articles included the same author, one the same department.
  3. †More than one option possible.
  4. †† All articles have either KM or % survival by risk group.
  5. $ Two articles with risk groups report two indices of discrimination.
  6. $$ Four articles are unusable, lacking one or other criteria.