Table 3.

Evaluations of dose distributions of PTV

	Group			P-value (ANOVA)	P-value (LSD, 3-shell vs 5-shell)	P-value (LSD, 5-shell vs 7-shell)	P-value (LSD, 3-shell vs 7-shell)
Parameter	3-shell	5-shell	7-shell
CI	1.12 ± 0.05	1.10 ± 0.04	1.09 ± 0.03	< 0.001	<  0.001	0.024	<  0.001
nCI	1.21 ± 0.04	1.19 ± 0.03	1.18 ± 0.03	< 0.001	<  0.001	0.185	<  0.001
HI	1.44 ± 0.01	1.44 ± 0.01	1.44 ± 0.01	1.0	1.0	1.0	1.0
GI	3.03 ± 0.14	3.09 ± 0.13	3.07 ± 0.14	0.012	0.004	0.368	0.037
Coverage (%)	92.63 ± 2.22	92.60 ± 1.83	91.79 ± 1.44	0.016	0.904	0.014	0.010
100%_PD (cc)	38.92 ± 12.31	38.45 ± 12.85	37.73 ± 12.62	< 0.001	0.036	0.002	<  0.001
50%_PD (cc)	117.48 ± 35.83	117.65 ± 36.53	115.09 ± 36.84	< 0.001	0.749	<  0.001	<  0.001
30%_PD (cc)	344.53 ± 119.93	312.90 ± 110.18	299.15 ± 106.41	< 0.001	<  0.001	0.006	<  0.001
MU	54,674.51 ± 13,149.78	54,649.06 ± 13,246.72	54,058.67 ± 12,744.23	0.018	0.914	0.016	0.012