Table 2.

Mean percentage reduction in volume for meningiomas with different initial volume after dose-staged Gamma Knife (%).

Time period	Total, n = 71	<8 cc, n = 29	8–12 cc, n = 28	>12 cc, n = 14	P
Second fraction	5.96	2.97	6.64	10.79	0.263
6 months	16.24	16.78	15.29	17.14	0.928
12 months	23	24.12	22.18	22.12	0.467
24 months	28.19	27.81	27.82	29.61	0.948
36 months	31.16	36.27	33.3	34.52	0.751