Table 3

Accuracy of four prognostic tools and clinical prediction of survival

ModelsPredicted survival groupActual survival timeSensitivity (%)Specificity (%)PPV (%)NPV (%)OA (%)Absolute agreement (%)
PiPS-ADaysWeeksMonthsTotal
Days318146.386.677.561.766.4
Weeks2426856.563.644.873.761.2
Months12121257.178.833.390.875.4
13451.5
PiPS-BDaysWeeksMonthsTotal
Days279040.386.67559.263.4
Weeks3120443.560.236.467.154.5
Months91717817739.595.677.6
13447.8
PPI<21 days21–41 days≥42 daysTotal
<21 days487458.578.881.454.766.4
21–41 days208733.375.522.983.867.9
≥42 days1491760.778.342.588.374.6
13454.5
OPS<21 days≥21 daysTotal
<21 days44953.785.78358.767.6
≥21 days3854
14567.6
CPSDaysWeeksMonthsTotal
Days4420666.761.262.965.163.4
Weeks1721845.771.345.771.361.9
Months55733.391.141.287.981.3
13354.1
  • Overall accuracy = (total sum of true positives and true negatives for each group of prognostic model)/total number of subjects. Absolute agreement = total sum of true positives of each prognostic model/total number of subjects.

  • CPS, Clinical Prediction of Survival; NPV, negative predictive value; OA, overall accuracy; OPS, Objective Prognostic Score; PaP, Palliative Prognostic Score; PiPS, Prognosis in Palliative Care Study; PPI, Palliative Prognostic Index; PPV, positive predictive value.