Table 3.

Comparison of median survivals between this study and original studies for each parameter.

Index	Median survival (months), group 1		Median survival (months), group 2		Median survival (months), group 3
	Current study	Original study	Current study	Original study	Current study	Original study
RPA	4.7	2.3	9.4	4.2	10.5	7.1
SIRa	4.7	2.9	9.3	7.0	12.3	31.4
BSBMb	3.0	1.9	5.8	3.3	12.4	13.1+
GPAc	3.0	2.6	9.2	3.8	10.5	6.9–11.0

RPA, recursive partitioning analysis; SIR, Score Index for Radiosurgery; BSBM, Basic Score for Brain Metastases, GPA, graded prognostic assessment.

^aOriginal study grouped SIR by 1–3, 4–7, and 8–10 (current study with 1–3, 4–6, and 7–9).

^bOriginal study grouped BSBM by 0, 1, 2, and 3 (current study 0, 1, and 2–3).

^cOriginal study grouped GPA by 0–1, 1.5–2.5, 3, and 3.5–4 (current study 0–1, 1.5–2.5, and 3–4).