Table 5. Dosimetric comparison of remaining brain volume in a previous study and our study.

A paired t-test (two-tailed) was performed, and the results were considered statistically significant when p-values were ≤ 0.05. In our study, the t scores were V5 (-7.19), V10 (-7.51), V20 (-2.58), V30 (2.51), V40 (4.54), V50 (6.49), and V60 (3.6).

Dose level	Lorentini et al., 2013 [22]				Our study
	Intensity modulated radiotherapy	Three-dimensional conformal radiotherapy	Difference	p-value	Volumetric arc radiotherapy	Three-dimensional conformal radiotherapy	Difference	p-value
V5 (%)	74.42	80.63	-6.20	0.04	75.09 (±19.02)	47.88 (±19.09)	+27.21	0.008
V10 (%)	60.67	73.45	-12.78	<0.01	64.46 (±19.53)	38.53 (±16.83)	+25.93	0.003
V20 (%)	36.59	50.87	-14.28	<0.01	39.86 (±16.64)	32.75 (±16.54)	+7.11	0.017
V30 (%)	24.31	32.77	-8.46	<0.01	22.11 (±10.71)	28.96 (±15.92)	-6.85	0.02
V40 (%)	15.86	22.08	-6.22	0.01	10.45 (±6.49)	24.83 (±15.88)	-14.38	0.22
V50 (%)	9.46	15.73	-6.27	0.01	3.95 (±3.25)	20.07 (±12.05)	-16.12	0.64
V60 (%)	2.34	5.93	-3.59	0.05	0.71 (±3.25)	4.65 (±4.66)	-3.94	0.002
Mean dose (Gy)	19.5	23.6	-4.56	<0.001	27.6 (±9.12)	26.88 (±7.59)	+0.72	0.59