Table 1.

Statistical Tests of Absolute Dose Deviation Indexes (DDIs) With and Without Similar Plan Selection.

Structure	Dosimetric Result	With Similar Plan Selection		Without Similar Plan Selection		Difference in Mean	95% Confidence Interval of the Difference in Mean		Statistical Test
		Mean |DDI| ± SE	Median	Mean |DDI| ± SE	Median				Paired t	Signed rank	Sign
Brainstem	Maximum dose	0.143 ± 0.013	0.091	0.150 ± 0.127	0.100	−0.007	−0.019	0.005	.132	.108	.056
Mandible	Maximum dose	0.175 ± 0.015	0.105	0.257 ± 0.016	0.213	−0.081	−0.102	−0.061	<.001	<.001	<.001
Larynx	Median dose	0.200 ± 0.023	0.103	0.260 ± 0.026	0.136	−0.060	−0.078	−0.041	<.001	<.001	<.001
Pharynx	Median dose	0.222 ± 0.014	0.186	0.342 ± 0.017	0.304	−0.120	−0.151	−0.090	<.001	<.001	<.001
Parotid_L	Median dose	0.162 ± 0.013	0.098	0.249 ± 0.018	0.153	−0.086	−0.110	−0.062	<.001	<.001	<.001
Parotid_R	Median dose	0.140 ± 0.015	0.061	0.222 ± 0.018	0.164	−0.083	−0.104	−0.062	<.001	<.001	<.001
SpinalCord_PRV05	Maximum dose	0.157 ± 0.011	0.112	0.179 ± 0.012	0.124	−0.023	−0.036	−0.009	<.001	<.001	.007
Cavity_Oral	Median dose	0.147 ± 0.011	0.107	0.205 ± 0.012	0.163	−0.058	−0.076	−0.040	<.001	<.001	<.001