Table 1
Determination of recursive partitioning analysis classes based on KPS score, age, and extracranial status

RPA class	KPS score	Age (yr)	Primary disease control	Mean survival (mo)
1	70–100	<65	Good	7.1
2	70–100	>65	Poor	4.2
3	<70	NS	NS	2.3

KPS, Karnofsky Performance Scale; RPA, recursive partitioning analysis; NS, non-specific.