That means that there is no inequality between the factors (health, income and education) within people in a country.
When that is the case, there is no inequity aversion* and the country will be ranked in a higher position depending on the percentages.
* Inequity aversion occurs when, there is is a difference in a specific index amidst people. When it doesn't occur, people have similar health conditions, similar incomes and education.
Hope it helped,
BioTeacher101
(If you have any questions feel free to ask them in the comments)