以下兩種說法是否都可接受？

If you compare the following two things:
(1) levels of heart disease among people (living) in rural areas; and
(2) levels of heart disease amoung people (living) in urban areas.

The correct sentence should be:
Levels of heart disease among people in rural areas are considerably lower than those in urban areas.

("those" refers to "levels of heart diseases among people")

你可以改成甘:
Level of heart disease in rural areas is considerably lower than that in urban areas.

Level of heart disease is considerably lower in rural areas than that in urban areas.