Table 5.

Mean survival rate for patients with a low or high-grade astrocytoma, based on treatment

Grade	Type of treatment	N (articles)	N (sample size)	I2	Egger’s test	Mean ± SD (months)
High grade	Radiation therapy	10	3498	100	0.224	29.6 ± 3.3
	Surgical	4	894	100	0.943	19.4 ± 7.4
	Chemotherapy and radiation therapy	2	206	100	-	45.2 ± 5.2
Low grade	Radiation therapy	6	3635	100	0.995	49.6 ± 7.9
	Surgical	3	263	100	0.880	71.4 ± 8.8