How is the health index calculated?

Hi! Doest anyone have any idea how does the health index is calculated? From what i have noticed, it's exponential.
As i tried to get to 180, i needed 2.3 more hospitals than the game says i need.
As in education and transportation, if i want index of 1.8, i have to multiply the needed amount with 1.8 and i get how many schools, highschools, universities, roads, traintracks or water treatment plants i need.
For health it's not the same

Those linear indexes depend only on population number. The health index has more than one component. One is number of pop. I think that is a linear relationship. However another smaller component is age distribution.

The age component seems to cause a feedback situation. Where if you keep buying hospitals, your population will get more older people. Then as you have more older people you need more hospitals.

I found out that if you just keep buying more and more hospitals, your population will keep growing, initially if you stop, your population drops. But keep buying and pop keeps going up. But its feedback acceleration, and the older not working part of your population is what is actually increasing. It's pointless because the more you build hospitals, the more you need.

I'm continuing the experiment into the next phase with my empire on KB. Each country has a different and fixed # of hospitals from 5000 to 10000. and

But to answer your question, no one has figured out the formula for it. But it may not matter because even if you have the same number of hospitals, you will see that the health index still oscillates a little as the pop distribution settles down.

And when your population is growing it's hard to see this.

Oxydoor,

It's not like education and transportation which are just a linear equation of, number of buildings, divided by number needed, times one hundred, equals index. IE, 10,000 miles of Road, with 5000 miles of road needed, would result in a road index of 200. As an equation (10,000/5000)x100=200.

PS the transportation and Education indexes take the LOWEST of the three indexes that go into them. IE, an Elementary index of 200, High school index of 210, and University index of 250, would result in an education index of 200, because it is the lowest of the three indexes that determine education. The equation is the same for Roads, Railway, and Water Treatment, determining the Transportation index.

Instead, healthcare index is non-linear, the higher you want your health index, the more you will have to exceed the needed number. Andy has never disclosed the exact formula. However, it's likely exponential, so each

There are really 2 questions. How is this Number Needed calculated. AND How is the index calculated.

One of those I'm pretty sure takes the age distro into account. And if not that then something else. Because it's definitely 2 factors. It's been apparent in my testing.