The metric type "4864 - Proportion of Education, Health and Care (EHC) mediation cases held which were followed by appeals to tribunal" value of 15 % for area Durham (Unitary) 2020 is calculated from:

9 divided by 51 + 9 multiplied by 100

"4863 - Number of Education, Health and Care (EHC) mediation cases that have been held which were followed by appeals to the Tribunal" divided by "4862 - Number of Education, Health and Care (EHC) mediation cases that have been held" + "4863 - Number of Education, Health and Care (EHC) mediation cases that have been held which were followed by appeals to the Tribunal" multiplied by 100