The difference between the HDP and AP scores did not achieve statistical significance for the remaining 26 normal tissue sparing objectives. Of those, 24 scores were equally divided in being either equal or higher for the APs, and two were in favor of the HDPs (percentages of larynx volume at or above 45 and 55 Gy). However the scores for the mean larynx dose and the volume at or above 35 Gy were higher for the APs. Incidentally, those were the two parameters that showed improvement after modifying the larynx goal in AP5.