Table 2.

R square values obtained for three multiple linear regression models in 981 patients for whom data on multiple prognostic variables were available

Model	KPS <40	KPS 40-50	KPS ≥60
CPS alone	0.46	0.35	0.24
Other prognostic factors alone	0.25	0.15	0.08
CPS and other prognostic factors	0.50	0.38	0.27

CPS=clinical prediction of survival; KPS-Karmofsky performance status score.