Colorado ranks fourth in the nation in terms of well being, according to a national analysis of 350,000 interviews conducted in 2008.

Only Utah, Hawaii and Wyoming rank higher, with Michigan, Tennessee and Oklahoma having the lowest well-being ratings, according to the Gallup Healthways WEll-Being Index, one of the largest survey of its kind.

The Well-Being index ranks the nation and each state based on life evaluation, healthy behaviors, work environment, physical and emotional health, and access to necessities.

The nation’s average is 65.5, with each point representing 2.2 million people — meaning that 144 million people have a favorable well-being. In Colorado, the ranking is 67.3, while Michigan’s ranking is 64.

The sense of well-being is higher in western states and lowest in the midwest and the south.