What are the effects of the Population Adjacent improvement bonus?

What are the effects of the Population Adjacent improvement bonus? - Man in Black Jacket Standing Beside Yellow and White Chair

If one builds a colonial hospital and hovers over the tile containing the improvement, the tool tip mentions a "bonus to adjacent improvements":

+2 Level to Population

colonial hospital tile icon
Unfortunately that's a pretty vague label. The best I can guess is that adjacent improvements like farms will have bonuses to growth?

There are other features and improvements that provide a bonus to population in the same text format, but its not clear at all how the bonus works.

Does anyone have any details behind the game logic of the population bonus?






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