play lansky score performance karnofsky scale pediatric status years older 
ps ecog performance status score subjects patient scale screening patients 
zubrod performance status patients ps karnofsky score criteria scale equal 
scale karnofsky performance kps status score lansky ps higher greater 
lansky karnofsky performance status score dependent adult pediatric age kps 
score karnofsky performance status greater patients higher adult adequate time 
age score years lansky performance karnofsky lps status scale kps 
kps score ci hct aged greater modified definitions rpa patients