“Level of centralization” is, I think, the most obvious option, although I think I prefer “degree of centralization” the most instances.

I don’t believe that there is any word that actually fits the sentence structure “Health _____ OF”, but normally in medical circles things either beneficial or harmful, so one would probably go for something like “10 harmful effects

  of __________" "10 ways __________  

can

  harm you" or perhaps "10 detrimental  

side effects

  of_________" although in today's  

world of over-sensionalizing things, for the tabloid-style title: “10 ways ____________ can kill

  you!" What  

are

  ways to damage your health? ".  

“