Table 3.

Cox regression models to assess the impact of age (<40 vs. ≥ 40), WHO grading (grade I + II vs. grade III + IV), KPS (≤70 vs. > 70) and initial treatment (no vs. external beam radiation or radiochemotherapy) on the relative risc to die

	Relative risk	95% CI	p-value
Age (years)
< 40	1
≥ 40	1.7	0.8 to 3.4	0.143
KPS
> 70	1
≤ 70	6.7	2.9 to 15.8	< 0.001
WHO grade
Low	1
High	1.8	0.9 to 3.6	0.104
Treatment
No tumor specific therapy	1
External beam radiation	0.4	0.2 to 0.9	0.021
Radio-/Chemotherapy	0.3	0.1 to 0.9	0.041