Skip to main content
. Author manuscript; available in PMC: 2019 Mar 1.
Published in final edited form as: J Pain Symptom Manage. 2017 Dec 6;55(3):792–797. doi: 10.1016/j.jpainsymman.2017.11.028

Table 2.

Discriminatory ability and relative performance of CPS, PPI

Concordance index (95% CI) AUC (95% CI) for 30-day survival AUC (95% CI) for 100-day survival IDI for 30-day survival3 IDI for 100-day survival3
CPS 0.58 (0.47, 0.68) 0.58 (0.47, 0.68) 0.62 (0.54, 0.70) -- --
PPI 0.62 (0.51, 0.73) 0.76 (0.66, 0.85) 0.64 (0.56, 0.72) -- --
Difference between PPI and CPS4 0.2 (0.15, 0.25) 1 0.18 (0.09, 0.27) 2 0.03 (−0.06, 0.12)2 0.15 (0.08, 0.21) 0.03 (−0.01, 0.07)
P-value <0.0001 0.0001 0.58 <0.0001 0.1478

Abbreviations: CPS, clinician prediction of survival; PPI, palliative prognostic index; CI, confidence interval; AUC, area under the receiver-operating characteristics curve; IDI, integrated discrimination improvement

1

A positive value indicates better discrimination for concordance index

2

A positive value indicates better discrimination for AUC

3

The relative change in slope is shown based on the integrated discrimination improvement. A positive value indicates better discrimination for PPI compared to CPS

4

The difference between PPI and CPS is a statistical comparison that calculates A-B and the appropriate standard deviation for this difference. A p-value <0.05 indicates that the difference between PPI and CPS were significantly significant